Sacred Geometry and Arithmancy.

[ericgrau]

Sacred geometry is op and so rewards math nerdiness. There is a penalty for failure but success is almost assured. When it is hard... then you only bog down the game more as a nerdy jerk. You can't use it to cast higher level spells than you normally could which is good. It still gives a 2 for 1 deal on metamagic feats and gives spontaneous metamagic to prepared casters. Meanwhile to spontaneous casters it says, "screw you, have a two round casting time if you want to use this feat, making it effectively worthless for you.". If that wasn't enough, it conserves high level spell slots.

Ya, way overpowered for one feat. Needs to be 4 feats at least, if not 6. But since it bogs down the game so much it is better to outright ban it.

Arithmancy is usually +1 caster level for a feat and a swift action, which is fair. At lower levels the check is less reliable making it weaker then. As long as the player adds it up before his turn it shouldn't bog down the game ad much but it is still a pretty dumb idea for a feat.