That’s how the first one was. The gimmick was that maps were randomized and instanced with specific events possible to show up. It incentivized re-running each map 6-7 times so you saw all the quests and bosses. It was very balanced around multiplayer though, so hopefully they’ve improved that.
Maybe this is why I bounced off. When I played, it felt okay up until I came up against my first boss, which was a total wall that kept teleporting away and kept spawning infinite enemies.
Yeah, the one that summons a bunch of rat things. The cool thing is you can just refresh the map and get a different boss. Each biome has 2 different bosses both tend to have Adds but usually one is better or worse with it.