Potion of Resistance (Shulker Shell in Awkward Potion inside Cauldron) conflicts with EnderIO's Levitation potion. Actually gives EnderIO potion as a priority. I've tried looking through configs to see if it can be changed in either mod and no luck.

Closing as the Ender IO issue was closed

Can you simply disable the Ender IO one? I also add my own Levitation potion.

I can look into a config option to set the item, but it's quite annoying to deal with, so maybe just individual toggles on each type. Will have to think about that one

If it's inside the config files in EnderIO, I'm not finding it. I can't find where any of the potion recipes are actually.

I might be able to offer a suggestion: perhaps a purpur block or chorus flower? It is equally in the end (end game vanilla), it might suit your needs.

I chose the shell because resistance is a pretty powerful effect (flat 20% damage reduction) and the shells are pretty rare, purpur is way too common for such an effect.

Gotcha, just trying to help. I might see if I can push this to SleepyTrousers to see if they know how this can be fixed on EnderIO's side.