Events

All player events fire synchronously on that player's owner thread. Pre events are cancellable; post events are informational after their corresponding commit.

Event	Timing	Cancellable	Mutable field	Cancellation/effect
SkillPreCastEvent	After cooldown/resource/condition checks, before the skill effect	Yes	None	Prevents effect execution, cost consumption, cooldown, and statistics.
SkillPostCastEvent	After the skill effect succeeds and costs/cooldowns commit	No	None	Reports player, skill id, and trigger id.
PlayerSkillSlotChangeEvent	Before equip, unequip, or trigger-binding mutation	Yes	None	Prevents the slot/binding update.
SkillPreUpgradeEvent	After validation, before charging and the roll	Yes	successRate	Prevents charge and roll; listeners may replace the effective rate.
SkillUpgradeEvent	After the upgrade attempt fully resolves	No	None	Reports before/after levels, rate, roll success, and downgrade state.

Both asynchronous cast entry points move event publication to the player's owner thread. Script actions and external skill-source collection do not create additional event classes beyond these documented runtime paths.