Jabes.plays.RPG says:
Yeah it's called "Edge" in Pugmire. "Advantage" is a D&D 5th Edition term.
Which version do you have?
I can't find "edge" anywhere, neither in PDF nor print. e.g. page 94 Help: Give a nearby (within 20 feet) ally an
advantage on an attack roll or ability check before your next turn.
page 86: Roll the die or dice. If the character has an
advantage, use the higher result. If the character has a disadvantage,
use the lower roll. A higher number is generally better.