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 / level | Health percent | Min–max tick | Interval | Damage ticks |
|---|---|---|---|---|
| Lesser / 0 | 7.5% | 4–16 | 2.25 s | 10 |
| Regular / 1 | 10% | 8–18 | 3.25 s | 10 |
| Greater / 2 | 15% | 12–20 | 4.25 s | 10 |
| Deadly / 3 | 30% | 16–30 | 5.25 s | 15 |
| Lethal / 4 | 35% | 20–50 | 5.25 s | 20 |
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.
Projects/UOContent/Misc/PoisonKinds.cs:78
Current standard registration valuesProjects/UOContent/Misc/PoisonKinds.cs:95
Darkglow and Parasitic schedulesProjects/UOContent/Misc/Poison.cs:105
Tick count and removalProjects/UOContent/Misc/Poison.cs:122
Current health and clamped tick formulaProjects/UOContent/Misc/Poison.cs:128
Darkglow distance bonusProjects/UOContent/Misc/Poison.cs:141
Poison damage and Parasitic raw healingProjects/UOContent/Misc/Poison.cs:153
40% revealProjects/UOContent/Misc/Poison.cs:66
Vampire and Orange Petals cure checksProjects/UOContent/Spells/Base/SpellSchoolConflict.cs:73
Stored Magery poison strength
Category: Character & combat