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Ruling · 900.29

Tremor against Armor and Insurance

This rule is part of the Comprehensive Rules, where every cross-reference resolves in one page.

Question
Why does Tremor underperform into Armor?
Answer
Because it is two damage instances, and the flat Armor reduction is applied to each one.
  1. 900.29aTremor splits its listed damage as evenly as possible into two hits. On an odd total the first hit takes the extra point, so 55 becomes 28 and 27.
  2. 900.29bBoth halves are real instances. Armor's percentage reduction is proportional and unaffected, but the flat reduction of 1 per 5 Armor is subtracted twice.
  3. 900.29cAgainst 40 Armor that is 8 flat damage lost instead of 4 — a fixed tax that hurts small Tremors far more than large ones.
  4. 900.29dThe split also fires damage reactions twice, which is often worth more than the Armor it loses. Against Insurance it now helps rather than hurts: two 20s are each covered by one point, where 40 as a single instance would have spent two.
  5. 900.29eShield is consumed twice as well, which can break a Shield with the first half and let the second half reach Vitality.
Worked example
  1. A Tremor listing 55 damage into a target with 40 Armor and no Shield.
  2. Percentage reduction from 40 Armor is sqrt(40) / (sqrt(40) + 20) = about 24%.
  3. First hit: 28 becomes 22 after the percentage step, then 14 after the flat 8.
  4. Second hit: 27 becomes 21, then 13.
  5. Total 27 Vitality damage. The same 55 as one instance would have dealt 34.

See also Tremor Insurance Shield AoE

Rules 500.2 Armor

In 900 Interaction Rulings