# Upgrade In order to increase rarity levels, damage stats, rewards and winning rates, players can upgrade their heroes using our built-in feature Each upgrade to a higher rarity level has a specific odd for success and only requires a number of tokens. This mechanics facilitates an intriguing gaming experience as players can upgrade a hero's rarity level from common to mythical effortlessly --- # 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://ancient-warfare.gitbook.io/ancientwarfare/special-feature/upgrade.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.