Aoe might be a problem but you can always go for fear, trap one, kill one, on to the next target. Use veil of blades for ultimate.

Had a 'warlock' type of build that uses destro staff, sap essence, mass hysteria and maleafic wreath for aoe. Take resto staff as your second wep and you can even cast healing ward and enter the fray going apeshit in the midst of the enmies, fearing and sap essence everyone while casting debilitate for magicka returns.

It's crazy but was sure a hell lot of fun doing that in public dungeons xD

Alright I've hit Lvl 15 and I've decided to go with destruction and restoration as your comments really helped the decision I am not too far off summoning shades and aspect of terror this is definitely the direction I'm going with I can't wait I am rocking fire staffs with flame runes and knock back for extra damage and room to work with inflicting cripple and path of darkness for speed moving from one to the next making use of agony with larger higher level mobs and still using teleport strike and veiled when it's tight both dish out more than enough damage as finishers I am finding it easier to destroy mobs of of 2-3 levels above my own where as before it was a struggle fighting npc at my level or lower I do a little bit of carry with my res with healing and personal and group buffs and siphoning I want to go the undaunted path with the webs and inflict fear, I'm also using fear and teleport strike, and a whole lot of shadow as well us the ultimate I'm loving restoration as the secondary choice healing and buffing abilities whilst dealing massive dps as well as slow and self haste also leveling mages guild I really want meteorite!! And the passive perks would make any Mage build relentless I am really loving this build so far I am hoping by Lvl 25 I should have all the abilities I want and can focus more on passives!!