People are hating on Necromancer mage spec? Hmm. I get Knight Enchanters are godlike and Rift mages are fun (I've got Solas as a Rift Mage), but Necromancers have some fun tricks up their sleeves to and work really well when paired with a Rift mage. Walking Bomb is decent DoT and its chain explosion works wonders for rifts and grouped up enemies (suck them in with that Pull of the Abyss, walking bomb, KABOOM!).
Also, you haven't seen beauty until you Spirit Marked a giant and take it into a fight against a High Dragon. Remember that giant vs dragon fight in the Storm Coast? Yeah. I actually did that in the Emerald Graves. There are two giants close to the High Dragon there. I attacked one, tamed it, and it joined in the fight against that dragon. So good. Haste + Firestorm + Giant made short work of that dragon, heh.