Looking to see if I have overlooked some items that inflict ele vuln:
I know about:
4 protean pets
All the deatharrows cats
The hare raiser weapons
Vampire and Werepyre subrace guests
Independence Daygur and Ancient Mother's staff weapons
Also the runic binding spells, and I guess the bag of mixed nuts is sort of the same thing tbh.
I think there's a pet from the Asgardian set if memory serves me correctly but its weak, so not concerned about it.
I prefer info on magic weapons, guests, pets, and miscs, but I'll take in other options.