Shadow Form got stealth-updated at one point for sure, probably because it was greatly inferior to Chilling Aura (the latter also seems nerfed for some time). Funny how the game generally took a decisive anti-tank and anti-defensive general direction at some point, now it's nearly a waste of time to try to develop a gladiator with a shield - so many things counter it with good effect that shields become practically useless for the top brackets (I'm doing one final experiment before declaring them dead though). At the same time Shadow Form seems to do nothing against Rages and Heavy Scarring in particular, hitting such a Rage is like hitting a War in heavy armour without Shadow Form.