Call of Chaos

You call upon the incredible power within you, setting it completely free. The next spell of 5th level or lower cast within this spell's duration is greatly empowered. When you cast this empowered spell, you roll a d8, and depending on what you roll one of the following will happen.

• 1: If you roll a 1, the spell deals additional damage equal to 2d4+your spellcasting modifier to all targets affected.
• 2: If you roll a 2, the spell ignores all damage resistances and damage immunities.
• 3: If you roll a 3, you roll on the Wild Magic Table seen in the Player's Handbook. 
• 4: If you roll a 4, you cast the 1st level spell Magic Missile onto one of the targets of the spell, this does not consume a spell slot.
• 5: If you roll a 5, after casting the empowered spell, you vanish into a harmless demiplane. You appear in the exact spot you disappeared in at the start of your next turn. 
• 6: If you roll a 6, you suffer one level of exhaustion, but the spell deals additional damage equal to twice your character level+your spellcasting modifier.
• 7: If you roll a 7, all creatures affected by the spell are subject to a Polymorph spell, in which they are turned into Giant Crabs if they fail their saving throw (see back of Monster Manual).
• 8: If you roll an 8, the spell deals its maximum possible damage.