So I consumed mine, it poofed from my bag and instantly the same window for completing the Mercenary quests in Ethermere popped up and again offered me the choice of accepting the 3AA or the glyph. I do not understand the words "reward set"
Spell effect: Consuming this glyph will grant you a reward set that allows you to choose between claiming some experience and recapturing that experience within the glyph.