Very annoying trophy! Couldn't find it here, so I'm posting my save file with 499/500 elites killed. Hope this helps
CUSA00242 - Skeleton Crew.zip
Continue with the Necromancer character, teleport to Zoltun and kill him or his goon with Command Skeleton.
CUSA00242 - Skeleton Crew.zip
Continue with the Necromancer character, teleport to Zoltun and kill him or his goon with Command Skeleton.