Starting with the issue of making things challenging. Allow players to start custom mission with sliders for
Starting level and level progression - what level enemies start at (100) and how quickly that level increases (10 levels every 5 minutes).
Stats - decrease/increase for things like energy, frame strength, weapon damage, ability cooldowns, etc.
Revive - how many you get and how fast players are revived.
Enemy numbers and types - nuf said.
And much more.
Rewards are also scaled based on what options you pick
.
As for modes
Add raids back in wi