# Artifact Catalog and Collections The Artifact Catalog is the list of Target Objects collected by the player, categorized by collections. Each collection has on average 5 Artifacts coveted by collectors all over the world. How often will you be able to collect them? You have probably asked yourself "What do you mean, I steal an item for a client and then need to get it back again?", the answer is: OBVIOUSLY! RaT is not the only thieves' guild. Other freelance thieves and clients can hire us to steal from other collectors. This is the criminal underworld, and it is this turnover that makes our business go round. With that, RaT has a 5-level Mastering system that counts how many times each thief has completed a contract that included a certain item. Upon completing each level of Mastering the thief can redeem a Cosmetic Item or Equipment related to the completed collection of items. --- # 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://rent-a-thief.gitbook.io/rent-a-thief-en/gameplay-and-mechanics/artifact-catalog-and-collections.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.