I just started yet another playthrough since i have nothing better to do atm...
I decided to create myself a wizard, finished the Nautiloid,summoned myself a raven familiar and went exploring. I cannot really believe that noone else had that idea but i found no funny video on youtube nor a thread in here.
I am not really sure if this is intended but:
-Familiars can trigger the grove fight, which ended with the goblins killing everyone including Zevlor while i was still standing at the beach watching Shadowheart sleep...
-Familiars can unlock waypoints, so i ended up running everywhere and opening up all waypoints (excluding Grymforge). You can teleport right to the underground temple if you like (i opted for the Myconoid colony and was promptly thrown out, funny)
-Some NPCs attack even Familiars on sight (Gobbos at blighted village entrance, why would they hit a raven or a rat?)
This was so far all i tried since i got tired but that opens up another list of problems.
Even after this, the Tieflings welcomed me as their savior, weird. And the usual impact of late game information on early game conversations and such.
Imo Familiars should not be able to either unlock waypoints, nor trigger story progress if it is not tested or wanted.
(if this is an old thing and i just failed to find it, sorry)