Guild Wars 2

Double-click to consume.
Nourishment (30m): Gain power [sic] equal to 6% of your toughness
Gain power [sic] equal to 4% of your vitality
+10 Experience from kills.

It actually gives you a bonus to precision instead of power. Hopefully this is just a typo and it is really meant to be precision. Since sharpening stones already grant the exact same bonus to power.

Yeah, it’s a known error. Like all Maintenance oils, it’s supposed to give a bonus to Precision. Sharpening Stones are the items that grant bonuses to Power.