Fire Pets. Make sure their DS is up and meditate while the enemies kill themselves. Summon replacements as needed.
This is very general,. you didn't specify a level range or accurate number of mages.
Do they have focus items for any element?
earth pet is a nice tank but you could do better with all water pets,. but you could do even better with all fire pets,. This is all based around all the mages having pets up and fighting a single target.
Air pet if you're fighting caster mobs.
6 earth pets low dps, high health.
6 water pets good dps, no mana free DS, medium health.
6 Fire pets good dps, free ds, low health.
I'd take my chances with 6 fire pets DDing, DSing and being replaced by mages one after another.
Any adds would get hit by the DS also,. you could literally walk through any dungeon
at your level with an army of 6 fire pets. Then med break somewhere.
Just make sure none of the mages themselves use a DD or heal spell.
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PS. I use to be super anti fire pet. I used earth pet fully buffed for the longest time before I made the switch.