Summon demonic (blood magic)

A caster speaks a incantation to summon a demon in his/her service the demon makes a pact with the caster in which is paid in blood. the caster must shed their own blood to pay for the demons service, depending what the demon is, dictates the amount of blood needed. the demon will stay and obey the caster for 8 hours. any longer and the contract must be renewed.
you can bargin with the demon on how much blood you give it (charisma roll)
if the caster is killed the demon will disappear
the demon summoned will have a base hp plus a die roll
if the caster dismisses the demon with anouther blood payment. the caster may call on the demon again with the HP stat it was summoned with, fixed. this ends if the demon is destroyed or is dismissed without blood payment.
you can only have 1 active demon per 2nd level
caster loses HP depending on the demon they summon