Amended. Char sheet and power cards added for printout.
Ok, for your lvl 6 power (a 'Utility Power'), I think the best choices are:
Warlock: Spider Climb (Encounter Power, Move action. You move with a climb sped equal to your speed). Run up the walls like The Matrix. Pretty cool.
Warlock: Fey Switch (Encounter, Move Action, Range 10. You and your ally trade spaces). Pretty neat, too. Excellent for getting out of trouble.
Warlock: Racing Fire of Ulban (Encounter, Move Action. You move twice your speed). Not bad either.
The Sorcerer lvl 6 utilities were pretty poor, in my opinion. Nothing there as useful or fun as these.
You also get a feat. I would strongly consider:
Reckless Curse (You gain +1 to attack against creatures affected by your curse. They get a +1 bonus back at you). How often do you get hit by your cursed target? And +1 to hit is quite good. (Plus, if they are by you, you hit them with Eyebite and become invisible to them anyway).
Implement Expertise (You gain a +1 bonus to attack rolls with any implement power using one type of implement). Pick this for Wands and it is a permanent +1 to ok. Ok, so probably better than Reckless Curse, since it is always on. Maybe stack Reckless Curse later for another +1!
Also not bad:
Psychic Lock (Any target you hit with a psychic power takes a -2 penalty to hit on its next attack roll). Most of your commonly used powers are psychic.
Anyway, those are the ones I would seriously consider.
Yuki_Cards_lvl6.pdf (271.68 kb)
Yuki_lvl6.pdf (69.59 kb)