Tri-Elements (トライエレメント, Torai Eremento) are generic stage enemies that are found in various stages throughout the Len'en Project. They are less common than fairies.
Tri-elements first appeared as a stage enemy on stage 2 of Evanescent Existence. The names of these enemies were unknown for years until they were revealed to return in Book of the Cafe. Based on the name, it's likely that they are entities that are manifested by three powers of nature.
Tri-elements appeared on Stages 2 and 3 in Evanescent Existence; Stages 2, 3, 4 and the Extra Stage of Earthen Miraculous Sword; and Stages 3, 5 and the Extra Stage of Reactivate Majestical Imperial. The reason why they attack the player remains unknown.
They did not make a return in Brilliant Pagoda or Haze Castle.
Book of the Cafe
Tri-elements are set to return in Book of the Cafe, being revealed in the Len'en 7th Anniversary Video. Exactly how they'll function remains to be seen.
- Tri-Elements were once called "Triple Elementals" (トリプルエレメンタル, Toripuru Erementaru) some point during development, as could be seen from certain Book of the Cafe teaser videos.