This is part of "Complete these Encounters IV" challenge of current blight league
Require 1 unique item to do this name Speaker's Wreath which cause ur minion can't kill anything unless when they burn enemy, so try make sure ur minion didn't deal any fire damage at all so that they won't deal any burn ailment damage on monster for accidental kill, also disable Phantasm on Kill cuz there's a bug they would kill regardless you're wearing this unique or not
Full challenge guide: https://redd.it/d1lu1t
My PATREON page: / vironlawck