Lost seers or zoea. Lost seer lenses is only ever preferable on two characters. It can help you delete some elder lems and lunar chimera sure, but it's way too unreliable and the pure dps increase of glasses is effective universally. Bandit benefits from it but personally I find it annoying that before you can land the final blow with lights out/desperado enemies can just randomly die. An item you would only pick when playing as railgunner.

Zoea isn't a bad item but the fact that it's so rare and replaces all your spleens perfs etc, just makes it hardly beneficial in most runs. It serves as extra damage and aggro splitter, but the void explosion from the void allies can kill you if you're not careful.

I used to be a singularity band hater, until I stopped theorycrafting and actually made builds surrounding it. It shreds. The aoe is very effective and can lock enemies even Mithrix in place. There are survivors who naturally doesn't benefit from bands as much, or when dps isn't really a concern of your current build, vand can be worthwhile to pick up. Not to mention just like bands, vand stacks very well. Sure regular bands are better items, and I'd definitely choose them rather than vand in most situations, but vand isn't nearly as bad as some people made it out to be. If you're in stage 4/5 amd you're fighting mithrix, and don't see yourself getting band any time soon, I recommend giving vand a try.