> For the complete documentation index, see [llms.txt](https://whitepaper.pethereum.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://whitepaper.pethereum.io/gameplay/fusion.md). # Fusion Players can fuse their pets into a new pet with a different rarity level, thus fusion is one of the most important mechanics of the Pethereum metaverse. When two pets enter the fusion chamber, a new pet emerges and inherits the physical traits of parent pets but the parent pets disappear forever. Since all pets have a rarity level based on their physical traits, the result of the fusion can be a pet with better stats or lesser stats. This result is solely based on the physical traits of parent pets because a new physical trait cannot be generated with the fusion. ![](/files/DmHiKI9FUT34oGc0lCU1) Calculation of fusion’s chances is simple since all the physical traits (hair, ear, eye, mouth, tail, feet, color, second color, body shape, pattern) have a rarity level and this rarity level will determine the result of the fusion. The dominance of a physical trait is based on the rarity level of the two fused parts. You can see fusion calculation below.