code/modules/antagonists/wizard/grand_ritual/grand_rune.dm

GRAND_RUNE_INVOKES_TO_COMPLETE	Number of times you need to cast on the rune to complete it
BASE_INVOKE_TIME	Base time to take to invoke one stage of the rune. This is done three times to complete the rune.
ADD_INVOKE_TIME	Time to add on to each step every time a previous rune is completed.
/obj/effect/grand_rune	Magic rune used in the grand ritual. A wizard sits themselves on this thing and waves their hands for a while shouting silly words. Then something (usually bad) happens.
/obj/effect/grand_rune/finale	Variant rune used for the Final Ritual
/obj/effect/decal/cleanable/grand_remains	Spawned when we are done with the rune

Define Details

Time to add on to each step every time a previous rune is completed.

Base time to take to invoke one stage of the rune. This is done three times to complete the rune.

Number of times you need to cast on the rune to complete it