Crank up the heat with a Fissure Druid and burn legions of demons to ashes! Because of how Fissure deals damage, the more mobs the merrier! The Fissure Druid, or Fire Druid, performs incredibly well in areas with densely packed monsters such as The Secret Cow Level, Stony Tomb, and Flayer Jungle.
What's that smell? Is something burning? Oh never mind, it's just the monsters.