Don't ask my why I tried these two together, but here we are.
Victus

crashlog

Seems to be a conflicting mixin injection error. I'll try to see if there's a workaround.

I'm going to mark this as unplanned as it would be a huge effort to try and make these two compatible. The thing is that Victus injects code in the middle of vanilla heart rendering, which Health Overlay completely cancels. Finding a way around this is kind of annoying. It's a really odd issue, as I would have to redirect each vanilla render call. But I might play around with it in the future if I ever want to make the mod more friendly with other mods.

EDIT: oh right, this would also be a fabric only solution. As the Forge API only allows me to cancel vanilla rendering like I do in fabric.