nothing other than witherstorm itself included into obsidian infestations

requires:

-Forge

-Cracker's Witherstorm Mod

-Optifine(may have problem with the CWSM's witherstorm render)(optional/required)

-Entity Texture Feature(required if you dislike the render)

-rubidium(recommended/optional)

credit:
Nonamecrackers2 - Cracker's Witherstorm Mod

Texture pack Compatibility:

Totally Accurate Witherstorm | Obsidian Witherstorm must be put above Totally Accurate Witherstorm

https://www.curseforge.com/minecraft/texture-packs/totally-accurate-wither-storm

VN4's Fresh Wither Storm + Reanimated Witherstorm Detailed | Extract the Obsidian Witherstorm pack to find the Addons folder, there you can find both Obsidian Fresh Witherstorm and Sickened Mobs. Sickened Mobs must be above Fresh Witherstorm, regardless of the obsidian witherstorm order. Obsidian Fresh Witherstorm must be above the Obsidian Witherstorm, otherwise it will cause two set of tentacles to appear.

https://www.curseforge.com/minecraft/texture-packs/vn4s-fresh-wither-storm

Note 2: Obsidian Witherstorm must be above TAW and FWS's addons.