There are homunculus familiars.Are there rules somewhere for making a homunculus? Is it a ritual?
I have three different rituals for this sort of thing: one for raising undead, one for calling and binding creatures, and another for creating constructs.
Each has a level 4 greater than the level of the monster you get (minions are valued at their level – 4, elite their level + 2, and solos their level + 4), and you have to make a check to see if you can control the monster.
There are a few subtleties to each one, but in general they work like that.