Is invisibility and sneaking the same thing? I know that magelight is supposed to reveal you if you're sneaking/stealthing, but I was under the impression that invisibility was a totally different animal, one that the nightblade abilities touch on.
They specifically mention sneaking characters when referring to magelight's ability. But I might just be nitpicking.
Anyway, thanks for the input! I think I'm going to go with Nightblade and check out some of the siphoning abilities, see if I can't make myself a loose set of skills to play with.
The sneaky-heals I had in mind wasn't so much spamming heals while stealthed/invisible, but being viable enough in stealth (having a bit of medium armor for the bonuses) to sneak past enemy lines with a group of stealthies and then act as a support and heals for them. I'll see if I can do anything viable with a bow for that, but if worst comes to worst, I suppose I could use a destro staff. I just hate the aesthetics of staves- it's bad enough using one for resto!
My other nightblade is going to be tank/DPS, that should be fun too.
Yeah, stealth/invis are different. Magelight will only effect Stealth. Invis won't be gamebreaking, so don't choose a character off of that. The best use of Invisibility is to use it while stealthing on a melee character so that you can get on an enemy without breaking stealth.
Mark Target is an amazing spell for NB DPS and that may actually be one of the best abilities in the game. For tank build though I'd recommend not being a nightblade, there isn't enough passive damage reduction.
There are ways to make everything work, and gear is going to be more important for pushing you into a role than abilities anyway, so unless you're going for an extremely specific build-type then I would just play what you think will be the most fun!