Great Arcane Group Dungeon Support

You can use Great Arcane, 1h Arcane, Witchwork.

With this build your goal is to increase everyone elses damage, shield your team mates & disrupt the mobs.

Great Arcane freeze is huge. Witchwork is a nice clump if some mobs didn't get fully pulled. 1H Arcane has strong silence & purge which is very strong vs certain mobs.

Basically you are a full utility support, dealing next to no damage. You buff the highest DPS with beam. You shield anyone who is going to take damage. You Refresh all cooldowns of team mates & you freeze/clump the mobs whenever you can.