Lets say someone wanted to cast a demonic possession spell on somebody and then wanted to master that demon with either mastery or control spells.
A) would you allow that?
B) if yes then by what exact procedure? (Bars, RR, chance of non controll, etc)
C) what would the statistics of the possessed being be? (as usual, as demon, a mix)
D) would you allow a character to develop a skill to control what demon he wanted for his possession? (Daedhel, Hothrog, Pale I, Tlaque etc)