A stalker could make a good vigilante; there is something to be said for quick remorselessness. Then, whoa! -- there was something new I did not know. Ice armor and been proliferated to the stalker archetype! I knew ice armor was good on tanks, and I suspected it would be great for stalkers, too. In fact the Chilling Embrace power, a melee-range aura that slows foes and reduces their attack rate, turned out to be better for stalkers than tanks. Plus, you could keep it on all the time, and it would not activate until foes realized you were there -- often too late for them.
Chain mail was another new feature I'd never used before, so Osceola got that as well. Sigh, I realize now that the in-game description is hollow. It should have been fleshed-out once I'd played him for a while.