The Slug Update, which improves upon Slug sectors, slug encounters, and more!
For a full changelog, please visit the forum post: Subsetgames.com
This file is kept as a zip. Do not worry, zips are the same as .ftl files! To make slipstream recognize the mod, do one of two things: use the rename tool to change the .zip extension to .ftl (needs to have show file types turned on), or go to slipstream, click the file tab, go to preferences, and toggle allow zip.
Multiverse also requires Hyperspace, the new hard coded modding API for FTL to function, as it adds tons of new functionality not normally possible. You can download hyperspace here: Subsetgames.com