I would like to see more "hidden" areas like the grotto was in vanilla. There needs to be more exploration. Imagine the ogre in the grotto is buffed to "kill the target" levels of health where you'd need a team to kill it in any reasonable amount of time. When you kill it it drops an item, a key. The key opens a door to Phogoth's chamber, but it's slightly different inside. There's now an accessible door that leads deeper into the hive structure. Something like that would be so cool. Just a ton of exploration.