1

Devastation! Roll twice and combine both effects (reroll any further 1s)

2

Blast radius! You and all near creatures take 2d6 damage

3

Duplicate refraction! You target yourself and the nearest ally with two identical copies of the spell

4

You flubbed the incantation! You cast a random spell from your known spells at the same targets, even if it would not normally be possible

5

Ethereal bandersnatch! Two random pieces of your gear disappear forever

6

Arcano-mutagenesis! You must pass a DC 12 Constitution check or a random stat drops to 3 (-4) until you successfully complete a rest

7

Boom! You open a 30-foot deep sinkhole in the ground with you at the center. You and all near creatures must pass a DC 15 Dexterity check or fall in

8

Petrification! 1d4 of your limbs petrify for the next 24 hours

9

Stupefaction! You lose the ability to cast all spells of the same tier until you complete a rest

10

It cannot be unseen! You must pass a DC 12 Wisdom check or descend into mad raving for 1d10 rounds

11

Radioactive energies! You whirl with repulsive energies, drawing the hostility and attacks of all enemies who can see you for the next 1d4 rounds

12

Uncontained channeling! You have disadvantage on casting spells of the same tier and lower for 10 rounds