Ryujin
Legend
If you do this via the multi-classing route, then eventually doing a power swap feat for a specific Warlock power would be well in keeping with the "mystical ninja" type of character. "Mire the Mind", at 7th level, makes you and all of your allies effectively invisible to the target. Sure, there are Rogue powers that are mechanically better from a damage standpoint, but that's just cool 
