I saw @Ictinus
mention on Discord a while back that feedback would be better put somewhere the developers are sure to see it, rather than just randomly strewn about on Discord. So, with that in mind, I'd like to give my thoughts on where it stands, and invite everyone else to chip in with their own (constructive) opinions. It's been a few days now, and I worry it's going to get neglected pretty quickly for a few reasons.
First and foremost, mob density is a problem to me. I have to say I really dig how strong the mobs are, especially one or two of them at a time. Dangerous, but not outrageously so. It's great. The problem lies with the groups of 5+ (sometimes up to 10!) that cluster in a handful of rooms. This does two major things: first, it insta-kills people (not fun), and it means there's less mobs to hunt in practicality. What mobs do break off of these clusters, have a tendency to wander quickly and can suddenly overwhelm you. Given how hard they chase, and how dangerous moving from one room to another is in an area with wandering strong mobs, this usually means you just die without any real recourse. Forcing the mobs to spread out better would go a long way toward fixing this.
Second, blackout. Overuse of blackout makes fighting mobs more like staring at a screen of blank lines, hoping you don't die before the mob does and guessing what you should be doing. Maybe some kind of mitigating factor like a blackout defense or giving mobs a condition to their blackout attacks would make this more interesting, but as it stands it's just too much blackout to really have fun with.
The two of these things kind of get exacerbated when you add the constant threat of pvp into the mix. It's really hard to jump someone, or respond to getting jumped, when moving one or two rooms away can mean you just die (from full) to 3+ wandering mobs instead of the person you're fighting, even if they've cleared a bit before hand. Some risk in this regard is great, but it's a bit overtuned right now I think. Any movement in the wrong direction can mean very quick death, which kind of gets in the way of good fights.
I don't really feel like these would be problems if this was just another bashing spot, but this is the Underworld! I don't want to see all the work done on that new dynamic system lost to people avoiding the place, and I don't want to lose the opportunity for a great new conflict zone.