I have not tried it but I assume doing something like this might work:
Use Mages and use Frost Nova (assuming they can be rooted if they can be slowed) -> Cone of Cold -> AE spam (very risky close to enemies) -> Frost nova and repeat...
Could also use Frost Nova -> Position far away -> Blizzard -> Blizzard -> Cone of Cold -> Frost Nova -> Position again for blizzard...
This wouldn't be good though, since those slimes change resistance so sometimes they are immune to frost spells and might get insta killed if hit by mobs when using Arcane explosion.
With warlocks it might work to use dots and curse of exhaustion when needed. Maybe able to keep 16 debuffs on every ghoul + 5 pets attacking. Might be decent damage.
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