
lair-master |

Posted this previously, but I'm hoping it may get a little more feedback with its own thread.
I'm playing an arithmancer, or what the common folk call a "mathemagician". In short, the character has discovered the "rules" that govern his world. With an abacus and a bag of seven magic dice, the arithmancer bends these rules to suit his ends.
While exploring the concept, I concluded that it would be weird to play a wizard who's all about math without acknowledging the math of the game itself. Hence the "Numerical Sight" power. Mathematical Mist was taken from the Crystalline Dust Form ability Axiomites possess:
Arithmancy
Associated School: Transmutation.
Replacement Powers: The following school powers replace the telekinetic fist and change shape powers of the transmutation school.
Numerical Sight (Su)
You recognize the math inherent in all things, enabling you to see them as they truly are: a combination of numbers, symbols, and equations. As a standard action you can gaze at a creature, object, or 5-ft. area within 30 feet and attempt a Knowledge (mathematics) check to determine the absolute value of a single number related to the target. For example, you could determine an enemy’s hit points, the Disable Device DC of a trap, or the hardness of a wall. The DC of this check is equal to 10 plus the target’s CR (if it has one). You can use this ability a number of times per day equal to 3 + your Intelligence modifier.
Mathematical Mist (Su)
At 8th level, as a free action, you can transform your body into a golden crystalline cloud resembling a shifting mass of glowing mathematical symbols and equations. In this form you can fly (30 ft. good maneuverability) and gain the incorporeal quality. You can use spells and spell-like abilities but cannot make physical attacks. This transformation lasts for a number of rounds per day equal to your wizard level. These rounds do not need to be consecutive.

Mikael Sebag RPG Superstar 2014 Top 16 |

For numerical sight, make it a Knowledge (engineering) check. Magical math, like the kind performed using the Sacred Geometry feat (from Occult Mysteries), is typically resolved using Knowledge (engineering). (Plus, that skill already exists in Core!)
I absolutely love that first ability, but the second one doesn't speak to me as much. I like Goth Guru's mention of mirror image, maybe there's something you can do with that?
Really flavorful stuff you've got here. Nice work!

Cyrad RPG Superstar Season 9 Top 16 |

I think divination works better as the entire school is about using magic to obtain and process information. Divination also deserves more love, and there's not enough material and design space to justify creating an entirely new school, which would require making many many spells. I'm also pretty sure the Pharaoh of Numbers was a diviner.
I also agree that the check should involve Knowledge (engineering) as existing material, like the Mathematical Prodigy trait, groups math into this knowledge.