It's called "Swarm" You and 5 other guardians are placed in a fortified bunker on a hill with ammo box spawns and an occasional heavy ammo box The objective is to last as long as possible, the waves are infinite with even more spawing every round, you must last as long as possible, the longer you go, the better the loot there would be a kill counter at the top left too for bragging rights (aren't using that part of the UI anyways) imagine it, you and 5 guardians, warding off a wave of 100000 enemies, supers going off left and right and bullets flying all while the words "Guardian Down" are being yelled, it would be GLORIOUS --EDIT-- Added a few things with some workarounds In Standard Mode the enemies will get only slightly stronger but stop to a tolerable level, you can still get overwhelmed regardless In Hard Mode the enemies will show no mercy, gaining a level up to the max every 10 waves Mind you there are no actual "wave" counters, its just an endless stream of enemies spawning at a rate that won't become a problem so long as you keep killing things. The loot rates in Hard Mode and Standard Mode are different, due to the fact that killing hordes of enemies is usually how engrams are obtained, the rates in standard mode are low, your killing millions of enemies you don't need 100 engrams dropping left and right In Hard Mode the rates increase after the enemies reach the current cap (32 if it was now) On some occasions you may encounter a super boss, yes, a super boss, he won't go to the bunker and he is a well enough distance away to be deadly, but killable, an example would be a Hive Ogre with 3X the health of Phogoth, now these bosses are rare and will drop rewards for actually killing them and since their spawn is random and rare you wouldn't be able to reset and keep killing him. I figured the scenery would get a bit bored after a bit so I thought of a few things, the maps would include one of each planet (even mercury) and would be randomly selected, like a strike playlist. There are Defensive items you may place with tokens you obtain from the minions of darkness, I placed "Souls" as a placeholder, I.E. you require 200 Souls to build a tar pit to slow enemies. They may also break your bunker, you have doors and are secluded until the doors break, there are small windows with a view of the doors so they you may delay this. The races of the Darkness are also not limited to their respective planets, you may encounter hive at the start on Venus, or Fallen on Mars, after a certain amount of time or waves has passed, another race may see an opportunity to strike, at either you, your current enemy, or both, this adds in bungie's idea that there are alliances and such in the Darkness, such as Fallen and Vex together or the Hive and Fallen fighting you and themselves. There is no "Victory", you simple kill stuff until you drop, you will then be rewarded for how long you held out. Guardians who do not start combat for 15 min will be auto kicked, don't want an Afker who gets loot for your hard work, 15 min is enough for an AFK and there should be no way you aren't shooting something or need to find ammo. --I may add on to this when I get more ideas together-- -edit note- I'm not gonna BS you guys, yes, I based it off multiple things: Gears of War Horde Mode for the defense structures and waves, Halo's Firefight Mode, Mass Effect 3's Platinum difficulty enemy spawns and I guess Warframe's Survival missions for the longer you go the more you get when you finish, there are a few more but those are the base so you are right to base it off other games, but the best way that I can describe what the experience should be is......that feeling when you kill like 30 thralls in a few seconds, It is very satisfying to destroy tons of enemies, I mean, thats what we have been doing anyways, why not give us more stuff to shoot with our shiny loot?