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秘儀の彗星
Keystone

Arcane Comet

ARCANE COMET
PhysicalMagicAdaptive

Launch a damaging comet on ability hit

Effect

Damaging a champion with an ability hurls a comet at their location. When a comet hits an enemy champion, the next comet's damage increases. Damage: 15 - 100 + (2 x total hits on enemy champions) + 10% bonus Attack Damage + 5% Ability Power. Cooldown: 16-8 seconds.

Gold Equivalent

Priced at item unit costs
402Gequivalent (match average)* estimate

Set by Hit damage (base only) alone

02505007501,000402
  • This rune
  • Other keystones
  • Flash 971

#11 of 13 keystones. Lowest: First Strike 171G; highest: Empowerment 891G

BreakdownMatch average per effect
  • Hit damage (base only)402G100%Lv1 88 → Lv15 780
By LevelThe headline is the mean of levels 1–15
  • Gold eq.
  • Match average 402
  • Flash 971
Lv1Lv5Lv10Lv15
Gold eq.88277454780
Damage1539.369.6100

Effect values split the description range evenly by level

Assumptions Behind This ValueTap for details
Combat only: 50%

Effects that only work in combat or under a condition are counted as active half the time. The same rule applies to every rune and spell.

At most once per 8s

Effects that re-trigger on attacks are counted at most once every 8 seconds, since a single fight only allows so many procs.

Damage valued like healing

Damage to an enemy is valued like healing yourself the same amount, priced with the health regen rate.

Ratios use a reference build

Build-dependent ratios such as 10% bonus AD are counted against a reference build (an assumption): 0 / 1 / 2 / 4 finished items at levels 1 / 5 / 10 / 15 (linear in between), each worth the median of the finished items that have that stat (AD 45 / AP 70 / health 350 / armor 40 / magic resist 40). Effects with ratios of two or more types (AD / AP / tank: health, armor, magic resist) count only the highest type (items use their own type), since four finished items can't be four of each type. In the Build Lab's combat power, the ratios use your actual build instead.

Full Calculation
Hit damage (base only) 15–14088〜780G

BasisIn-game text (captured 2026-09-23): Base 15-100 (even by level) plus 2 per comet hit. Fights match takedowns (0 / 3 / 5 / 10) with 2 hits per fight: 0 / 6 / 10 / 20 hits, so 15 / 51.3 / 89.6 / 140. Spread over the 16-8s cooldown with the Heal formula; the 10% bonus AD / 5% AP ratios counted against the reference build; only the higher of the AD-type and AP-type values is added; 50% for the on-hit trigger

  1. 115–140 ÷ 16–8s cooldown × 5 × 50% uptime = 2.34–43.75 per 5s. 2.34–43.75 ÷ median base regen 8–19 = 29–230%. 29–230 × 3G= 88–691G
  2. 2Ratio: reference build bonus AD 0–180 × 10%= 0–18
  3. 3Same formula for 0–18= 0–89G
  4. 4Ratio: reference build AP 0–280 × 5%= 0–14 (not counted: the AD type is higher)
  5. 5Total 88–691G + 0–89G= 88–780G
  • Match average: mean of levels 1–15 = 402G

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