Ninja Master

The Ninja Master is an NPC involved with the Death Lotus Training event. Talking to him for the first time of every prestige will complete a kebbit-level task, and yield either a skill-specific small XP lamp or a small prismatic lamp (dependent on his location) and two shuriken stamps.

Locations
The Ninja Master teleports around occasionally, therefore the location he may be found in varies. His location differs per world. The Death lotus training scroll must be brought to complete the kebbit-level task. He will only give the lamp and stamps if you selected "I'm ready to learn!", but the task will still count as done if "I know everything already." was selected instead. Players who want to complete the task but retrieve the lamp later may do this.

A good way to meet him is to go to one of these locations and hop worlds until you see him.