D10Catastrophe
1.Caster explodes, dealing 3d6 to everything Close
2.Swap locations with one random ally
3.Spawn a chaos portal, spilling hordes of cyberdemons
4.Randomly up/downgrade a each stat to either a d2 or d20 until death
5.Until death, you believe allies are the enemy
6.Dramatically all Near terrain based on the glyph
7.Reroll spell effect with random stat, glyph, and target
8.Swap bodies with the target (or nearest creature) until death
9.Spawn your evil twin, there can only be one
10.Summon a sudden natural disaster based on the glyph