Vac is like a vacuum like in you house. It will suck all those material in where ever you lead it to. Put that in a game version. It will suck the mob where ever you move the character and the mob will not hit back. Basically you will lure more than 20+ in an few second and kill them at once with aoe and they will not hit back.
~~As above you will need vac + internet + good pc. To get the maximum of the mob u can lure.
Since you asked that and new to this forum also asking question in the right question section. Click
[Only registered and activated users can see links. Click Here To Register...]. That will lead you to the hack forum of 2moons. DO a bit of reading around. It would help a lots. Look for things that say usa folder.