I see a good amount about the Invulnerability power set; however, I'm more curious about the effect stackable Stone/Ice Armors would have on players choosing Invulnerability. Why would a player choose a power set that did not protect from psionics, when they could easily choose one that would not only protect from psionics, but everything else as well? It seems to me that stackable armors really make Invulnerability a lesser choice.
Maybe I don't understand exactly the intent of the DEVs, but to provide an example, at the moment Invulnerability provides players moderate protection from everything except psionics. With stackable Stone Armor, a player would have high or extreme protection from everything including psionics.
I understand that Stone Armor is a toggle based power set while Invulnerability is always on, but there are ways to get around the endurance cost of the armors, as they are not that draining to begin with. It really seems to me that stackable Stone Armor would put Invulnerability to shame.