Master's Reward
From Guild Wars Wiki
Master's reward is obtained by completing missions to the highest level in either Factions or Nightfall. It can include completing the mission in a certain time limit, or completing certain bonus goals. In Factions, the former is more usual, with the exceptions of The Eternal Grove and Gyala Hatchery; in Nightfall, the latter, with the exceptions of Grand Court of Sebelkeh, Ruins of Morah, and the final mission.

