As far as I know, Companions, and Familiars, and Gaurdian Spirits, and the lot are waiting for the completing of Risen to install all the parts needed to make pets a working, developable system.

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"...I am inclined to think the focus of the [Warmage's] spellbook should be ways to make things explode, to help you make things explode, or to assist your victim in exploding." -Armifer