Now I wonder what kind of healing, protective, and strength giving powers, would be useful to fight for hours on end.
Considering the fact that they where the most skilled in combat of any order and Epigraph of chapter 37 in WoR specifically points out the Stonewards similarities to Taln, the greatest warrior ever.
Sufficient mass to Crack plate. Crack it not break, and certainly not enough to go through the plate and kill the person inside.