RUMBLETiGER
Adventurer
You should probably eliminate any damage dealing spells, or any with area of effects.
"I'll drink my Potion of Fireball! What happens?"
(Dm facepalm...)
Go to a party.
Find your rival.
Empty his glass.
Open potion of Fireball.
Pour potion into glass.
Walk away at a considerable distance and wait.