What endgame content would you like to see?

[Phenidate]

I'd love to see something like dynamis that requires alliances and tactics.

I'd agree with that. Fights right now seem to be big zerg rushes in the end. Some monsters do 'interesting' things right now, that I'd love to see more along the lines of in terms of in-fight variety.

Like the crab, who goes into his shell for a massive defense boost. You have to break his shell with an incap (using Trunksplitter) to deal massive damage. At least, crabs with enough health - like Old Six Arms - live long enough to incap work like that