I always thought the Infinite Forest could be able to add end game boss encounters for players to group up and kill. Considering the Forest simulates pretty much every enemy race barring the Taken, it already is set up in a pretty good way to allow for basically infinite kinds of boss fights. Allow for different tiers of bosses as well, such as your basic kind of boss that youd find in a Strike with very minor mechanics for casual play, have another tier where they are a little more complicated, but not too crazy, something along the lines of how Skolas was in D1, and then the top tier would be your Raid level boss encounter where they can go crazy with the mechanics. Something like that i guess