# Skilltrees You can think of skilltrees like classes for players (for example knight and archer). #### Skilltrees (.st.json) This is a skilltree file. Every skilltree has it's own file. #### Skills Any Ability has it's own custom option that can be set in the skilltrees. #### Upgrades An upgrade will change the settings of a skill. It can add a row to the inventory or add more damage.\ Every upgrade is applied on a level rule that determines when it will applied.\ An upgrade can be applied on fixed levels or on repeating schedules like every 3 level. ### Inheritance Skilltrees are capable of inheritance which means if **skilltree** `a` inherits from **skilltree** `b`, **skilltree** `a` will have all the upgrades form **skilltree** `b` and in addition to it's own upgrades. --- # 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://wiki.mypet-plugin.de/systems/skilltrees.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.