GURPSよろず

Only allowed on abilities that affect others for at least a minute.
Your enemies can end your ability’s ongoing effects with a simple act: kissing the subject, speaking three words, etc.
If this condition isn’t met, the effects have their usual duration.
This is worth -5% if the condition is arcane enough to require research;-10% if a skill roll (against Religious Ritual, Ritual Magic, Thaumatology, etc.) can discover it; or -20% if common knowledge.
These values become -0% (a special effect), -5%, and -10% if the condition is difficult to arrange even if known, like a kiss from a princess or words spoken by an elf.
Abilities that can’t end until a certain condition is met just have Extended Duration, Permanent (+150%).
This enhancement already requires such a condition – you can’t take Terminal Condition separately.
Uncontrollable Trigger see Uncontrollable, p. 106