Pretty much the title, I'm making homebrew Feats to apply the 'Shadowfell Despair' optional rule modifiers to the character sheet. Tried to do 'Apathy' and found a feat can offer Advantage on Initiative but not Disadvantage. I assume it's just such a niche thing it'd never come up for most people but it'd be cool if someone could add it to the list so my fighter doesn't keep thinking he has advantage instead.
Cheers

I am looking for something like this as well, with a cursed item.

Same. It's so weird that an item homebrew can give advantage on initiative, but not the opposite.