Umbrellas...? And less content...?

[Theodric]

Palace of the Dead to floor 200, Heaven on High to 100, Maps.

Maps are more RNG than a challenge, though. POTD and HOH are pretty fun, though I struggle to find people to do it with. The higher floors also take a while to reach so the first portion is just rushing through to reach the point where it requires planning.

Personally I'd love to see more 4 man content that is tough outright and can be queued for.