Enium.zip is a release file of the Minecraft resource pack Spirit of Enium Extra Resources, made for Minecraft 1.16.5, 1.16.4. It was published on May 9, 2021 and is 1 MB in size. For the full description, screenshots and every other version, visit the Spirit of Enium Extra Resources resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.