Prismarine V2.12a is a release file of the Minecraft shader Prismarine Shader, made for Minecraft 1.7.6, 1.9.1, 1.16.3, 1.13.1, 1.9.3, 1.8.7, 1.7.4, 1.7.7, 1.7.5, 1.16.1, 1.9.4, 1.9.2 and more. It was published on May 3, 2021 and is 1 MB in size. For the full description, screenshots and every other version, visit the Prismarine Shader shader page.
How to install: Put the .zip into .minecraft/shaderpacks (do not extract it) and select it under Options → Video Settings → Shader Packs. Needs Iris or OptiFine.