Guild Wars 2

does Adrenal Implant + vigor stack ? ( 150% Endurance regen ? )

I’m very sure it doesn’t, similar to how movement speed buffs (e.g. signets) will not stack with swiftness, so speed is effectively capped at 133%.

Although I can’t find any documentation explicitly stating that.

Ran a few timing tests in the mists. Indeed, it does not stack.

adrenal implant is a wasted 30 point talent since the 10 point alchemy trait gives you the 100% end regen every time you get swiftness, which is either done through speedy kits (perma vigor) or the swift on crit (also near perma vigor).