Bloody Path? Fuck that, look at the other level 15 rogue daily power, Garrote Grip. You can run up to a dragon, give it the Crippler Crossface, and watch as it drops unconscious after the three-count since it has low chances of breaking the grab, what with no skill training in Acrobatics and Athletics.

Why stop at living dragons, I mean, undead can be knocked unconscious and put to sleep in 4e, so you can choke the shit out of a fucking dracolich. And hey, you can suffocate a beholder by... I dunno, jumping onto it and strangling its eyestalks or something.