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Poison damage, timing and families

From UO:PvE Wiki

Poison damage is recalculated from the victim’s current health, bounded by poison strength, then reduced by Poison Resistance.

Development source reviewed on 29 October 2026. In-game availability is unverified.

Standard poison tick formula#

Before elemental resistance, a normal tick is clamp(1+floor(current health×percent), minimum, maximum). Magery-applied poison can then multiply this amount by the caster’s stored school-strength scalar. The damage is 100% poison damage and uses the ordinary elemental-resistance path.

Standard poison schedule#

All five standard strengths begin with a 3-second initial delay. The damage-count column counts damaging ticks; poison removal occurs on the next scheduled tick if it has not already been cured.

Strength / levelHealth percentMin–max tickIntervalDamage ticks
Lesser / 07.5%4–162.25 s10
Regular / 110%8–183.25 s10
Greater / 215%12–204.25 s10
Deadly / 330%16–305.25 s15
Lethal / 435%20–505.25 s20

Special families#

Darkglow uses the matching strength schedule, but increases its computed tick by 10%, rounded down, when its source is on the same map and more than one tile away. Parasitic uses the matching schedule and heals its source when on the same map within one tile. The Parasitic healing call uses the computed pre-resistance tick amount; it does not read back the target’s final damage.

A poison tick has a 40% chance to reveal a hidden victim. Vampiric Embrace attempts to cure poison below level 4 at the start of a tick; Orange Petals do so below level 3. These checks are separate from the standard damage calculation.

Source notes

Show 9 references

These references identify the reviewed shard files. Source presence does not establish live availability.

  1. Projects/UOContent/Misc/PoisonKinds.cs:78
    Current standard registration values
  2. Projects/UOContent/Misc/PoisonKinds.cs:95
    Darkglow and Parasitic schedules
  3. Projects/UOContent/Misc/Poison.cs:105
    Tick count and removal
  4. Projects/UOContent/Misc/Poison.cs:122
    Current health and clamped tick formula
  5. Projects/UOContent/Misc/Poison.cs:128
    Darkglow distance bonus
  6. Projects/UOContent/Misc/Poison.cs:141
    Poison damage and Parasitic raw healing
  7. Projects/UOContent/Misc/Poison.cs:153
    40% reveal
  8. Projects/UOContent/Misc/Poison.cs:66
    Vampire and Orange Petals cure checks
  9. Projects/UOContent/Spells/Base/SpellSchoolConflict.cs:73
    Stored Magery poison strength

Category: Character & combat