# Skill Stone Items Users gain Skill Stones after each victory in the Battlefront Game mode. Skill stones allow Mongen to forget current skills and learn a new skill from a list of skills for powering up or changing strategy. ## **Skill Stones are divided into four main types:** * **Normal Stone:** Forget the current Basic skill and learn a new skill (except Premium skill). * **Premium Stone:** Forget the current Basic skill and choose a new Normal skill to learn. * **Runed Stone:** Forget the current Active skill and learn a new skill (except Premium skill). * **Premium Runed Stone:** Forget your current Active skill and choose any new skill to learn. [Click here to see more detailed information](https://testnet-docs.monsterra.io/gameplay/develop-mongens/skills-of-mongen/change-skill-set) ## Body parts and Skill Stones relationship * **Head:** Determines a list of essential skills that a Mongen can learn. The rarity and the total number of skills in the list depend on the rarity of the part. The skill list is randomized from the moment Mongen was born. * **Eyes:** Determine a list of active skills that Mongen can learn. The rarity and the total number of skills in the list depend on the part's rarity. The skill list is randomly set up from the moment Mongen was born. * **Horns:** Determine the troop that a Mongen owns in slot #1. The rarity depends on the rarity of the part. Each troop has its basic skills and active skills. * **Tail:** Determines the kind of troop that Mongen owned in slot #2. The rarity depends on the rarity of the part. Each troop has its basic skills and active skills. * **Back:** Determines the kind of troop that Mongen owned in slot #3. The rarity depends on the rarity of the part. Each troop has its basic skills and active skills. --- # 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://whitepaper.monsterra.io/monsterra-world/mongens/skill-stone-items.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.