Poison Necromancer
While this character struggles being built from scratch, after the accumulation of some gear the Poison Necromancer becomes one of the strongest Heroes in the game capable of quickly tearing down most areas even on /players 8 in no time at all. This character also uses way less Skill Points than most characters, leaving a lot of room for options in what to add to the build.
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Video Build Guide
Poison Necro ends up with a lot of leftover Skill Points. You can Max out Corpse Explosion, throw more points into Lower Resist, or become a Summoner to gain additional damage and survivability!
Some of the best places for this character to farm include The Travincal Council, The Secret Cow Level, and many of the Area Level 85 Zones in the game such as The Pit.