Yep, another little house rule tweak that popped into my head for Dungeon Crawl Classics. It’s simple and can makes things a little more interesting.
Instead of the normal wizardly spell casting bonus of the character’s level, replace it with a Deed Die. Just look at the Fighter progression table to see what die type a wizard of equal level would get and there you go. This really underscores the chaotic nature of magic. That fifth level magic user rolls a one on the Deed Die and poorly on the d20. Well, tough luck.
Going along with the Deed Die theme, why not add in some Mighty Acts of the Arcane. Want a small side or special effect for that spell? GO FOR IT! And it works the same way as Mighty Deeds of Arms.
What about that Natural Twenty roll? For that the gets to roll and additional Deed Die and add that onto the total.
Now, this is just an idea and I haven’t play tested it and who knows somebody probably smarter and prettier than me has already thought of this idea. Heck, this idea will probably be tweaked and twisted a few times before it makes it to the table.