warstamp is Lv 44
before they added the new Lv 60 passive for WMs, there was a general skill called blood return (Lv 70)
no idea what its about (there was no description available)
but what i remember from the icon, it looked like a sword with a
"recycling"-looking arrow
like, when you deal damage to an enemy, you get some hp back from the enemy
that would be a good answer to our lack of HP regen passives
for some reason though... they removed it from the General Skill list
the exact requirements are in the War Master Guide
EDIT:
i heard the Lv 70 HL skill makes them a force to be reckoned with
its an AXE-Throwing skill (Ranged attack, Causes "massive" bleeding effect, and deals "massive" damage)
it sounds like a one-hitter-quitter
But, im a WM, and always have been, so..
you'd have to ask a HL about that one