The third boon comes under the philosophy vedanta. It's a system of philosophy which deals with rites and rituals. The first and second boons are concerned with the worlds, ialoca paraloca. A third boon is concerned with brahman. But what does the third boon tell us? Whether it's a horror movie, a tragedy or a comedy, it's a movie. And that reality is, of course, you yourself.
Swami Sarvapriyananda teaches the Katha Upanishad, which is one of the most popular Upanishads. The scripture concerns the story of a young man who goes to the house of death to find out what happens after death. The reply describes the nature of reality and the meaning of life.