I would like to see integrations added for the mod mentioned in the title.
I confirm it is available for the latest Minecraft version (1.20.1) at the time of writing.

About the mod

Reliquary is a very popular mod about these pseudo-religuous/magical items you can find in loot chests and craft.
https://www.curseforge.com/minecraft/mc-mods/reliquary-reincarnations
https://www.curseforge.com/minecraft/mc-mods/curios

Link to mod source/API:
https://github.com/P3pp3rF1y/Reliquary
https://github.com/TheIllusiveC4/Curios/wiki/How-to-Use:-Developers

What should be integrated exactly

Reliquary has various items that affect 'undead', these seem to not be able to interact correctly with vampires, such as the big golden cross or the 'glowing water' which both damage undead (zombies/skeletons) greatly.
It would also be nice if the vampires either could not use these items (not throw them or attack with them) as they are 'blessed'.

Reliquary has several tools that fit right in with the witch-hunter flavor of the vampire mod, so i think they would work really well in that aspect.

Secondly, the curio API adds baubles and the like, which are currently incompatible with the vampires mods, such as charms and belts and necklaces etc. Would be really nice if the necklaces could be worn using the same slots as reliquary/curio.
However the vampire menu also works, so this is honestly secondary in importance.

I can help with

Testing

Additional comments

Really cool mod, love it, well done