Triggers for contingent spells are usually events that happen to the bearer of the spell, and can include death, contracting disease, exposure to a breath weapon or to energy damage, falling, exposure to a breath weapon or to a dangerous environment (trapped by fire, plunged underwater, and so forth), succumbing to sleep or fear effects, gaining negative levels, or being rendered helpless, deafened, or blind.
If the bearer of a contingent spell is the target of a dispel magic, the contingent spell might be permanently dispelled (but not triggered), as if it were an active spell in effect on the target creature.
No it isn't.Crust said:The “usually” in the first sentence is exactly the kind of thing a player would pounce on in an attempt to manipulate the spell beyond reasonable bounds, and it should be clear to that player that the DM will second guess such a generous interpretation of “usually.” “Usually” does not equate to “any other trigger the player can imagine.” That should be obvious to everyone, really.
You have not shown any rock-hard evidence backing up your interpretation. You have only shown examples that do not cover the interpretation in question.Rock-hard evidence exists that backs up my interpretation, and though some of it is 2E evidence, some of it is also 3E evidence. It shouldn't be unreasonable that if my mind is to change, only rock-hard evidence will change it. If that evidence doesn't exist, then yes, this conversation is over.
If the bearer of a contingent spell is the target of a dispel magic, the contingent spell might be permanently dispelled (but not triggered), as if it were an active spell in effect on the target creature.
Starting simple... I would word my contingency spell so that it would cast antimagic field when "Someone other than me begins to cast Disjunction."
The “usually” in the first sentence is exactly the kind of thing a player would pounce on in an attempt to manipulate the spell beyond reasonable bounds, and it should be clear to that player that the DM will second guess such a generous interpretation of “usually.” “Usually” does not equate to “any other trigger the player can imagine.” That should be obvious to everyone, really. The usual triggers are above, but the wizard can also set up a power word or wiggle of the nose to activate his/her contingency. It’s either that or the trigger examples above, each of which require the wizard to suffer the effect first, gaining the benefits of contingency second.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.