Reward lamps are a reward from the repeatable event after Death Plateau. They give 180 experience in any skill. Players must take the supplies from Commander Denulth to the Ambush Commander, and the Ambush Commander gives 3 of the lamps. The task can be repeated five times, for 15 total lamps (2700 experience); however, they only give 100 experience per lamp when they are given by Denulth as a direct reward from the quest.
The lamps are bankable, unlike the other reward lamps in the game. The lamps stack in the bank with lamps gotten in the same run (i.e. one stack for the three from the end of the quest, and one stack each for every time you help the Ambush Commander).