Three of these dark sorcerers, all level 50, destroy my team of level 60 pets within the first few turns of the last battle in this dungeon (that I'm aware of) every single time. I am trying to find good gear for my pets (which is proving to be pretty difficult) and I'm still really not sure whether I'm going about building the skill trees effectively.

Is there a special thing I need to beat these dark sorcerers? They seem way too tough for me to simply put on some better gear and voila. Also, what is the most effective way to build your pets skills, especially once they're level 50+?

This thread should help you :)
https://www.sylestia.com/forums/?thread=15571