I changed to Oracle from Stone Arrow. The build is all about Ranged DPS maximization and utility. Your role is to DPS your nuts off and use Mirror Lite and Wings as utility to counter the boss fights when they use Bleed and Fire Burst. Your other role is to control adds via kitting when needed or burn down eggs/spawns.

You are effectively playing two roles. Main Ranged DPS and Healer Utility Support. The biggest thing you need is mana endurance via pots/food/buffs and other means you can find. You will burn through a ton of mana if you are cycling the AoE Arrow of Boom. If you want to go mana light and turn down your dps a tad to stretch mana then don't hit Arrow of Boom every time its up, especially with a single Boss mob. That is where the balance and skill really comes into play with this build. Managing your DPS output and Mana consumption so you can stay in the fight and putting DPS down range the entire fight.

Don't make me have'ta Troll ya Bro!