What does origins:hotblooded mean?
Also what is the power type used for the scare_creepers because I want to make one called scare_skeletons?

Hotblooded makes you immune to Poison and Hunger status effects.

Scare Creepers doesn't have a power type but is hardcoded, thus can't be generalized to other mobs.
I added an issue as a feature request for this: #144