[quote=Skallewag] Yes, he does follow me into combat. He is controlled by my friend. I have literally no control over him. What, do you think I've been poisoning myself the whole time? After getting zombie on half my party? And then building a build to escape myself?
This clarifies a lot. Your original post sounded like you were poisoning yourself the whole time. Now it seems that it is a trouble coordinating tactics with your friend. If either of you have zombie on any member of the party, all players need to change tactics to take advantage of this talent and not make it a liability.
Your friend needs to stop following you in combat and move his zombie character away from the tank and instead rely on poison to protect him.
Also, grouping close is typically a bad idea anyway because of powerful AOE and environmental effect combos.