# Upgrading Features ## Fusion Select and merge THREE random cards of the same level to create ONE higher level card. Special cases: \ \- To upgrade a Level-5 card to a Level-6 card requires THREE cards of the same level and type. \ \- To upgrade a Level-10 card to a Level-11 requires TWO cards of the same level and type. All Fusion activities will cost $MOL and waiting time is mandatory. ## Mutation Mutation costs respective Essence Crystal and $RADI as fee. Mutant Skills: When the card reaches the Rare level, a new slot will be unlocked, allowing the card to have an additional skill in addition to the card's default skill. Mutants will be able to change this 2nd skill. Mutant Stats: change the card's attack and defense stats. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.mollector.com/gameplay/upgrading-features.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.