I have an idea for "End Game Content" I came up with the idea after hearing my friends complain that this game has no end game content. Well here it is
Rikti Planet
After reaching level 50, you can talk to a contact of some sort, and he goes on telling you that we could stop a Rikti attack by attacking the base on their home planet. The mission would require a team of eight and if decided there could be multiple teams of eight going into the same mission and they could be split up into squads, like Delta, Alpha, Omega, or it could have 1 team of eight heroes and one team of eight villains, the heroes/villains then board a space ship to reach their destination.
Each squad would start in a different part of the base or outside forcing them to infiltrate it
After reaching the main room of the base there will be a giant monster or AV fight then after successfully defeating the giant monster or AV you arm a bomb then run back to extraction (Space Ship)