Recite an incantation and carve a rune into an inanimate object or region of an object no larger than 10 feet in any dimension to have cast a spell the caster knows when it's triggered, expending a spell slot of the level of the spell you encoded, taking minutes equal to twice the spell level. Destroying the rune would not dispell the effect but destroying the object, defined as damaging it such that it was in pieces equal to half its mass or less would. You could direct the spell to act as you behave, defining the position of ranged spells, the actions taken by the spell could not depend on anything other than position and who triggered it where, unless the spell created something which could see and/or think in which case you could set guidelines. The trigger could be any of several things, including:
- a codeword or phrase said
- a codeword or phrase said by the caster or someone they know
- being touched
- being touched in a designated spot
- taking a certain amount of damage, the maximum damage one could set was 10 times the caster's level
- a specific symbol being traced with an appendage or carved into it
- a spell being cast or a magic item being used in the vicinity, which could be a radius, or a cone or a cube facing a certain direction, the maximum range for all of these was 50 minus 5 times the spell's level
- a spell the caster knows or a magic item the caster has used being cast or used in the vicinity, refer above for the vicinity
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