Celtic Heroes

Hey, I'm a level 215 rogue and was wondering what gear/skills/stats I should use to be useful at edl and eg bosses as a support rogue.

Expose Weakness, Smoke Bomb, and Poison Weapon
and all remaining points on dex (after you're satisfied with your amount of hp)

Get dog pet on top of what aileron said. Gear should be dex and cunning boosting. Skulls and living flesh necro rings are great