Spell trigger (many schools)

Spell trigger was a spell that allowed another spell to trigger on conditions.

Effects
While memorizing the spell, the wizard had to cast (or touch the caster of) another spell, less powerful than the spell trigger itself. Then, conditions were set, akin to the magic mouth spell, and the other spell stored in the trigger would be activated upon those. The caster could then cast the spell and touch an object; if the conditions set during memorization ever came true within, the second spell took effect.

The spell trigger itself could linger for millenia untriggered.

Components
Beyond verbal and somatic components, the spell also needed a pinch of ash from a burned scroll, which had to be bearing a spell at the time of burning.

History
Azuth made this spell available through Elminster sometime prior to.