If you had to pick only ONE affix you hate the most, which is it?

Specify your class and affix and why.

For me, it's waller. I'm a DH and moving/vaulting around a lot is mandatory and obviously, the walls hinder that. In addition, I need to use my gloom sparingly. I try and use it when I have direct access to leech life with my arrows but then a wall comes up and I can't leech. Wasted another gloom and didn't get any health back.

Curious about other classes and affixes.