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Vac is like a vacuum which suck things in. For 2moons it will get all the mob 1-2 window screen away and pull them toward you. Normally you can get 3 mob exception for summoner because of pet. You can get from 50 mob+ depending on your computer spec. Also there something call No Aggro which mob will not hit you. Combine both together. Mob will run toward u in a mass amount and they will not hit you. Then you can aoe and kill em.