The Antrippan rebirth quest takes place in Ashlish.

First, follow the path to the oasis, and find the tablet. Then, enter the temple. In there are four obelisks in the four corners of the courtyard, each with a riddle. The answer to each riddle is a letter. Combine the four letters to form a word.

At the central obelisk in the middle of the courtyard, say the word to proceed.

Inside the temple is a room with an altar, and corridors in the four cardinal directions. Waypoint glyphs allow you to travel back and forth through the temple.

Follow each corridor to solve a different puzzle and get a rune. Put the runes into your tablet.

In one corridor (I think it was to the west) you will have to reflect and then fight a copy of yourself. Fight, then surrender.

When you have all four runes in your tablet, return to the altar and insert your tablet.

When you complete the quest, you will be reborn instantly.