More comedic gold, bud!
(no room in my sig, though. )
Fair enough, but isn't making things like explosive runes cost XP going too far in the other direction?
Especially with my dm, who does xp in a way that lost xp can never be caught up. Also, he's already given wizards (and to a lesser extent, other T1 casters) some significant nerfs: No gate (or other calling spells), no shapechange (or polymorph or polymorph any object) xp rules that make using spells with xp components worth it only as absolute last resorts, if even that (and makes crafting something of an iffy proposition for anyone without a craft reserve)
I agree that letting more than one rune go off at once is insane, though.