This is purely a fun silly build that came about due to the Werebear Skill on Beast. By transforming into a Bear, the Sorceress gains a massive boost to tankiness and can use items and her Skill Masteries/Enchant to create a deadly melee combination.
Video Build Guide
The Bear Sorceress is purely meant to be a meme build. It can be a funny build to bring out into PvP games and catch a squishy character off guard and two shot them though.
A mercenary with Infinity will greatly increase your Damage. Both the lightning and Fire Damage you do are boosted by lowering enemy resistances, and enemy defense is reduced to have a better chance of hitting.