I mean if it's confined to geothermal vents I'd think bugs would be the absolute outside limit for most complicated life, and realistically it's probably prokar

I mean if it's confined to geothermal vents I'd think bugs would be the absolute outside limit for most complicated life, and realistically it's probably prokaryotic life if anything. That would still be mindblowing, and also horrifying when you think about the Fermi paradox.