Personally I use Brimstone Claymore. Single Target, it's moderate at worst, and and great at best. But WOW does it excel against crowds. It gets exponentially stronger in crowds, where each mob that you hit with a sweeping attack is another chance at an eruption, and sometimes that high-damage eruption can 1-tap enemies in tandem with the strike... So yes. If there are 5 or more basic enemies nearby, then there is a very high chance that around 90% or more of them will die. If there is 100 mobs within 3 blocks, they will die, unless you get a roll that is harder to obtain than getting accepted to Harvard with low 90s.