Insane wizard magic effects

[LucyG92]

The party is going to fight a mad wizard soon, and I'd like to work in some kind of mechanic for his spells going wrong due to the madness. I was thinking about using the 'Wild Magic' system from the Gamemastery Guide p.188 (concentration check or a random effect from the table happens), but wondered if anyone has suggestions for something that would work better?

[The Sideromancer]

you could give him the Confounded Casting spellblight (concentration or casts another spell of same level)

full text:

A spellcaster with confounded casting has a mental disconnect between the spells she intends to cast and the spells she actually casts. The first time on her turn that she casts a spell or uses a spell-like ability, she makes a concentration check with a DC of 15 + twice the level of the spell being cast. If the concentration check fails, the caster must pick another spell or spell-like abilityof the same level or lower to cast with the same Casting Time. If the spellcaster has no other spell or spell-like ability, the action is lost. The spell or spell-like ability she originally picked is not spent and she can attempt to cast that spell again later.

Confounded casting is cured by any effect that removes confusion or insanity. Creatures that are immune to mind-affecting effects are immune to this spellblight.

[AlaskaRPGer]

Use this table for more options!

here!

For more wildness, have his entire lair be infused with chaos so every spell sets it off.

[Dastis]

Grog of Substantial Whimsy table is pretty great

5e sorcerer wild magic table is nice but a bit limited

I've tried the table AlaskaRPGer posted before but found it a bit to harsh. To each his own

Rod of Wonder tables from most any game are fun