# Void Altar The void altar is a multi-block structure that allows you to obtain void essence. This essence is used in other crafting recipes. Most notably the recipes to craft Passage of the Abyss. {% embed url="" %} Void Altar {% endembed %} {% hint style="info" %} The white candle of this structure is the trigger/interaction block. {% endhint %} To get the altar to produce void essence you must sacrifice Black Dyed Sculk to it. Some seconds later, void essence will be produced. --- # 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://vertex-wiki.gitbook.io/allura/multi-block-structures/intro-to-multi-block-structures/void-altar.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.