Nikosandros said:
I'm a Physicist (and BTW, additions, multiplications, etc. are arithmetic, not algebra!), I like the numerological flavor of the feat, but I think I would never allow it. Stopping mid-action for a player to do a bunch of calculations doesn't strike me as particularly fun...
Yeah, most of my players couldn't do the calculations fast enough for combat to keep flowing. But they're also self-aware enough to realize that, so we'd never have a problem.
But we also discourage in-combat summoning, shapeshifting, and eidolons/companions for the same reason.
Spell memorization mastery: Memorize the entry of a spell. Before play begins prove to the DM you can recite the spell's entry in the rules from memory. If you do you can use the spell in addition to the spells your character has prepared, and without using a spell slot.
You mean
mnemonic enhancer?
Actually, I've run into a several GMs that use the houserule that if you don't know what a spell does when your turn comes up, you can't cast it. Obviously the balance plays out differently, but it's testing the same skill as your joke feat and
mnemonic enhancer.
And, certainly, plenty of GMs use the old "if you can't remember the bonus, it doesn't apply" and "decide your action or we're moving to the next person" table rules.
Getting back to the most obvious example, shapeshifting and summoning: the powers of memorizing Bestiary entries for fun and profit. Do these 1d4+1 celestial dire sharks come pre-jumped?
What I'm trying to say is: rewarding characters for their players' skills and decisions is neither new nor shocking. If you don't like
this particular example, by all means don't use it. It probably won't come up in my games either, but it's not some sort of revolutionary development.
Cheers!
Kinak