Bonestorm

Bone Altar odds

Every probability and guarantee the game server uses for gear summons. One data file drives the server, the in-game ODDS sheet and this page.

Odds version 1Valid from 2027-02-01Published 2027-01-25

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Summons are not open in the game yet. This page shows the probabilities that will apply when they open.

Summary

Each summon provides one item. The probabilities applicable to your next summon appear below. They depend on your guarantee counters and the selected banner.

The focus chance is 50 % when a Legendary is obtained, unless your next Legendary is already guaranteed to be the focus item. It is not a 50 % chance per summon.

Published long-run rates are averages across many summons and are not the probability of your next result. Expected summon counts are averages, not guarantees.

This page shows three different kinds of numbers:

  • Next-summon probability: depends on your counters. The game shows it live on every banner (ODDS); the table "Probability of your next summon" lists every possible state.
  • Guarantees: conditional promises (Legendary at summon 80, Epic within 10, the focus guarantee, step-up and beginner guarantees, the Forge Dust exchange). They are rules, not percentages.
  • Long-run averages ("including pity"): how often each rarity comes up on average over many summons. They are not the probability of your next summon.

Price: 150 gems per summon, 1,350 gems per 10 summons (10 % less than 10 single summons at 1,500 gems). Every summon also grants 10 Forge Dust.

Counters and guarantees

  • Legendary counter: the number of summons since your last Legendary on that counter. It goes back to 0 when you obtain a Legendary. There are three counters: Standard; Featured (shared by every featured banner, including step-up summons); Beginner. A counter carries over between banners that share it and does not reset when a banner ends.
  • Legendary chance of a summon: 1 % for summons 1 to 60 since your last Legendary; from summon 61 it is 1 % + 4.95 % × (summon − 60), i.e. 5.95 % at summon 61 and 95.05 % at summon 79; summon 80 is always a Legendary.
  • Epic guarantee: a separate count of summons since your last Epic or Legendary on the same counter (it goes back to 0 on either). If the 10th summon in a row would otherwise be Rare, it is an Epic: the Legendary chance stays as above and Epic takes the rest (Rare 0 %).
  • Other rarities while the Legendary chance rises: Epic keeps its base 10 % and Rare takes what is left; once the Legendary chance is above 90 %, Epic is the remainder and Rare is 0 %. The probabilities always add up to 100 %.
  • Focus guarantee (featured banners): if a featured Legendary is not your focus piece, your next featured Legendary is your focus piece. It ends when you obtain the focus piece. It carries over to later featured banners and then applies to the focus piece you choose there.
  • Step-up steps: the number of step-up 10-summons you bought this month. It goes back to 0 at 00:00 UTC on the 1st of each month and does not change the counters above.
  • Guarantee replacements: the ten summons of a step are first drawn with the rules above; then at most one result is replaced to meet the step's guarantee (see the step-up and beginner sections); then the counters are updated from the final ten results.

Probability of your next summon

Probability of your next summon for every counter value. Counter = summons since your last Legendary on that counter; the next summon is number counter + 1. Rows 0 to 59 are identical.

CounterNext summonLegendaryEpicRareEpic (Epic-guaranteed summon)
0–591–601 %10 %89 %99 %
60615.95 %10 %84.05 %94.05 %
616210.9 %10 %79.1 %89.1 %
626315.85 %10 %74.15 %84.15 %
636420.8 %10 %69.2 %79.2 %
646525.75 %10 %64.25 %74.25 %
656630.7 %10 %59.3 %69.3 %
666735.65 %10 %54.35 %64.35 %
676840.6 %10 %49.4 %59.4 %
686945.55 %10 %44.45 %54.45 %
697050.5 %10 %39.5 %49.5 %
707155.45 %10 %34.55 %44.55 %
717260.4 %10 %29.6 %39.6 %
727365.35 %10 %24.65 %34.65 %
737470.3 %10 %19.7 %29.7 %
747575.25 %10 %14.75 %24.75 %
757680.2 %10 %9.8 %19.8 %
767785.15 %10 %4.85 %14.85 %
777890.1 %9.9 %0 %9.9 %
787995.05 %4.95 %0 %4.95 %
7980100 %0 %0 %0 %

Beginner banner: rows 0 to 48 apply (1 % Legendary); summon 50 is always a Legendary.

Per item, for the same states. Standard banner: each of the 39 items has the same share. Featured banner: "focus" = your chosen focus piece; "other L" = each of the other 38 items as a Legendary; "set E" = each of the 5 pieces of the featured set as an Epic; "other E" = each of the other 34 items as an Epic; Rare = each of the 39 items. (g) = while the focus guarantee is active (other Legendaries are then 0 %). (Eg) = on an Epic-guaranteed summon (Rare is then 0 %).

CounterStd L eachStd E eachStd E each (Eg)Std Rare eachFocus LFocus L (g)Other L eachSet E eachSet E each (Eg)Other E eachOther E each (Eg)Rare each
0–590.0256 %0.256 %2.538 %2.282 %0.5 %1 %0.0132 %1 %9.9 %0.147 %1.456 %2.282 %
600.153 %0.256 %2.412 %2.155 %2.975 %5.95 %0.0783 %1 %9.405 %0.147 %1.383 %2.155 %
610.279 %0.256 %2.285 %2.028 %5.45 %10.9 %0.143 %1 %8.91 %0.147 %1.31 %2.028 %
620.406 %0.256 %2.158 %1.901 %7.925 %15.85 %0.209 %1 %8.415 %0.147 %1.237 %1.901 %
630.533 %0.256 %2.031 %1.774 %10.4 %20.8 %0.274 %1 %7.92 %0.147 %1.165 %1.774 %
640.66 %0.256 %1.904 %1.647 %12.88 %25.75 %0.339 %1 %7.425 %0.147 %1.092 %1.647 %
650.787 %0.256 %1.777 %1.521 %15.35 %30.7 %0.404 %1 %6.93 %0.147 %1.019 %1.521 %
660.914 %0.256 %1.65 %1.394 %17.83 %35.65 %0.469 %1 %6.435 %0.147 %0.946 %1.394 %
671.041 %0.256 %1.523 %1.267 %20.3 %40.6 %0.534 %1 %5.94 %0.147 %0.874 %1.267 %
681.168 %0.256 %1.396 %1.14 %22.78 %45.55 %0.599 %1 %5.445 %0.147 %0.801 %1.14 %
691.295 %0.256 %1.269 %1.013 %25.25 %50.5 %0.664 %1 %4.95 %0.147 %0.728 %1.013 %
701.422 %0.256 %1.142 %0.886 %27.73 %55.45 %0.73 %1 %4.455 %0.147 %0.655 %0.886 %
711.549 %0.256 %1.015 %0.759 %30.2 %60.4 %0.795 %1 %3.96 %0.147 %0.582 %0.759 %
721.676 %0.256 %0.888 %0.632 %32.68 %65.35 %0.86 %1 %3.465 %0.147 %0.51 %0.632 %
731.803 %0.256 %0.762 %0.505 %35.15 %70.3 %0.925 %1 %2.97 %0.147 %0.437 %0.505 %
741.929 %0.256 %0.635 %0.378 %37.63 %75.25 %0.99 %1 %2.475 %0.147 %0.364 %0.378 %
752.056 %0.256 %0.508 %0.251 %40.1 %80.2 %1.055 %1 %1.98 %0.147 %0.291 %0.251 %
762.183 %0.256 %0.381 %0.124 %42.58 %85.15 %1.12 %1 %1.485 %0.147 %0.218 %0.124 %
772.31 %0.254 %0.254 %0 %45.05 %90.1 %1.186 %0.99 %0.99 %0.146 %0.146 %0 %
782.437 %0.127 %0.127 %0 %47.52 %95.05 %1.251 %0.495 %0.495 %0.0728 %0.0728 %0 %
792.564 %0 %0 %0 %50 %100 %1.316 %0 %0 %0 %0 %0 %

Long-run averages

RarityStandard / Featured: Base rate (counter below 60)Standard: Long-run average per summonFeatured: Long-run average per summonBeginner: Long-run average per summon
Legendary1 %2.075 %2.078 %2.21 %
Epic10 %14.61 %14.6 %14.89 %
Rare89 %83.31 %83.32 %82.9 %

Average over 10,000,000 simulated summons of the server's draw function, in 10-summons from counters at 0. Not the probability of your next summon.

Standard banner: long-run average per item

Long-run average per summon for one specific item, next to the base rate.

ItemSetLegendary (Base rate (counter below 60))Legendary (Long-run average per summon)Epic (Base rate (counter below 60))Epic (Long-run average per summon)Rare (Base rate (counter below 60))Rare (Long-run average per summon)
Knight's BladeWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Tumbling AxeWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Revenant ShieldWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Death SpiralWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Seraph BeamWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Arcane BoltWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Storm WandWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Frost RingWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Thorn SpiralWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Hexfire PistolsWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Spirit FistsWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Bone ThrallsWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
EarthsplitterWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Holy CenserWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Blade RushWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
RiptideWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
HemorrhageWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Bone CrossbowWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Grave RocketsWeapon0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Gravewarden VisorGravewarden0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Gravewarden PlateGravewarden0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Gravewarden GripsGravewarden0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Gravewarden GreavesGravewarden0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Gravewarden SealGravewarden0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Abyssal CrownAbyssal0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Abyssal ShroudAbyssal0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Abyssal TalonsAbyssal0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Abyssal TreadsAbyssal0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Abyssal EyeAbyssal0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Stormcaller HoodStormcaller0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Stormcaller RobeStormcaller0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Stormcaller BracersStormcaller0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Stormcaller StridersStormcaller0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Stormcaller CoilStormcaller0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Hunter's CowlHunter's Pact0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Hunter's JerkinHunter's Pact0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Hunter's GlovesHunter's Pact0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Hunter's TreadsHunter's Pact0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %
Hunter's TotemHunter's Pact0.0256 %0.0532 %0.256 %0.375 %2.282 %2.136 %

Featured banner schedule

Featured banners run 14 days and rotate through the sets. Times are UTC.

BannerSetStartEndDebut (new set)
feat_2027_02aAbyssal2027-02-012027-02-15
feat_20270215Gravewarden2027-02-152027-03-01
feat_20270301Stormcaller2027-03-012027-03-15
feat_20270315Hunter's Pact2027-03-152027-03-29
feat_20270329Abyssal2027-03-292027-04-12
feat_20270412Gravewarden2027-04-122027-04-26
feat_20270426Stormcaller2027-04-262027-05-10
feat_20270510Hunter's Pact2027-05-102027-05-24

Monthly step-up

Each month (from 00:00 UTC on the 1st) you can buy five step-up 10-summons on the featured banner, in order. Step 1 costs 810 gems, 40 % less than the regular 10-summon price of 1,350 gems; steps 2 to 5 cost 1,350 gems. Every summon uses the featured banner probabilities above; a step's guarantee is applied after its ten summons are drawn.

StepPrice (10 summons)GuaranteeLegendary per summon (average)At least one LegendaryAt least one featured-set Epic or better
1810—1.008 %9.632 %59.13 %
21,350—0.992 %9.498 %61.92 %
31,350If none of the ten is an Epic-or-better piece of the featured set, one result is replaced by an Epic piece of the featured set (each piece equally likely): among the results that are not Legendary, the one with the lowest rarity, and among equals the latest. If all ten are Legendary, the guarantee counts as met.0.999 %9.548 %100 %
41,350—0.993 %9.492 %61.7 %
51,350If none of the ten is a Legendary, the 10th result is replaced by a Legendary (focus guarantee and the 50 % rule apply).10.04 %100 %82.41 %

Averages for a player who starts step 1 with all counters at 0 and no focus guarantee and buys the five steps in a row. Your own odds depend on your counters, shown in the game.

Beginner banner

Once per player: 50 summons in 10-summons. The first 10-summon is free; the others cost 1,080 gems each (20 % less than the regular 1,350 gems). Own counter: a Legendary is guaranteed within the 50 summons. If the first ten contain no Epic-or-better set piece, one result is replaced by an Epic set piece (each of the 20 set pieces equally likely), chosen by the same rule as the step-up guarantee. Pool and per-item shares: as the standard banner.

RarityBase rate (counter below 49)Average per summon over the 50 summons (from counter 0)
Legendary1 %2.21 %
Epic10 %14.89 %
Rare89 %82.9 %

At least one Legendary in the 50 summons: 100 % · Legendaries per 50 summons (average): 1.11

Forge Dust exchange (guaranteed route)

Each completed summon on a gear banner grants 10 Forge Dust (paid, ticket, ad and gift summons alike). An eligible Legendary of your choice costs 1,500 Dust (or 20,000 gems), an Epic 500 Dust, a Rare 170 Dust. Starting from zero Dust, 150 summons provide enough Dust for a Legendary without salvaging items.

Eligible items: every item of the summon pools (39 items). The pieces of a new set become available in the Forge 28 days after its debut. Available exchange items and any availability dates are shown in the Forge.

Interaction with the other guarantees: Dust is earned independently of the counters; exchanging Dust changes no counter and no focus guarantee. Salvaging items you own adds Dust, which is not counted above.

Together: a featured focus piece that is available in the Forge is yours after at most 150 summons, starting from counter 0 and zero Dust (by a summon or through the Forge). While it is not yet in the Forge, the limit is 160 summons (twice the Legendary limit).

Summon Tickets and the Altar Vigil

  • A Summon Ticket is one summon on a gear banner (the beginner banner takes ten at a time), with exactly the probabilities and guarantees of that banner shown on this page.
  • Altar Vigil (30 days): 1 ticket is credited to your account automatically on every day of the pass, whether or not you open the game. Credited tickets do not expire.
  • Tickets bought with money or obtained through a paid product (Altar Vigil, premium pass or event tracks, bundles, conversions) are paid tickets. Players under 16 can only use tickets earned for free.

Expected number of summons

Starting state: all counters at 0, no focus guarantee, zero Forge Dust. Priced at the regular 10-summon price (135 gems per summon). Not included: step-up and beginner discounts, free summons and tickets, salvaged Dust. Averages are not budgets or guarantees; your result can be better or worse. Prices in your local currency are shown by the store before purchase.

  • Any Legendary: 48.2 summons on average (median 62), at most 80.
  • Your chosen focus piece on a featured banner, without Forge Dust: 72.4 summons on average (median 67, 90 % within 129), at most 160.
  • With the Forge Dust exchange (focus piece available in the Forge): 72.4 summons on average, at most 150.
  • At the regular price, the focus piece without Dust takes about 9,768 gems on average.

Zero probability, exclusions and restrictions

  • Common items: 0 % on every banner.
  • Not in any summon pool (0 %): Iron Helm, Bone Mail, Grave Gauntlets, Swift Boots, Soul Charm. They come from other sources in the game.
  • Countries: summons are not offered where paid random items are restricted (currently: Belgium (BE)); there are no summons of any kind there, including tickets and the ad summon. The Forge sells every item directly instead. We use the store country and the network country to apply this.
  • Players under 16 cannot make summons paid with gems, paid tickets or purchases; summons with tickets earned for free and the ad summon stay available.

Good to know

  • Buying a summon does not guarantee any particular item, except where an express guarantee on this page applies.
  • Every summon is drawn on our server with a cryptographic random number generator and recorded.

Changes

We publish changes to item pools, probabilities and guarantee rules before they take effect, stating the effective date and time. Changes apply prospectively. Existing guarantee progress is handled as stated in the change notice and applicable law. If an urgent correction prevents advance notice, we explain the correction promptly and provide any remedies required by law.

VersionDateChange
12027-01-25First published rates (Bone Altar launch).