The Ultra Mastery XP Potion is a Celestial item in Pet Simulator 99. The potion grants level 99 to a mastery of the player's choice.
Ways to Obtain[]
- Rebirthing for the ninth time.
- The Forever Pack.
Trivia[]
- As of Update 33, the Ultra Mastery XP Potion can appear in the Forever Pack.
- This is the first potion in game that is untradable.