trying to unlock elite deep archemedia while solo was a mistake

I'm on mobile and first I thought those were all red crits.

It's the new endgame mode. You'll need to catch up on the quests in order to access it, specifically Whispers in the Walls.

It's a set of 3 missions like Sortie, but to get rewards you have to equip gear from a randomized list as well as activate debilitating gameplay modifiers. The missions are done back to back, no returning to a hub or orbiter in between.

STORY SPOILERS AHEAD; READ AT OWN DISCRETION

Once you unlock all the Main Story Quests and complete Whispers in the Walls, the character "Necraloid" in the Sanctum Anatomica will offer a new Game Mode called "Deep Archimedea", which is a series of three missions, played in a row without intermittent break or loadout swaps, featuring Level 400 enemies. This gamemode offers a set of rewards that can only be unlocked by applying certain negative conditions to yourself like not being able to use the Operator, Gear Wheel, Energy Drain among others. Furthermore, you can't revive in this gamemode if you're playing solo. If you bleed out without getting revived, you're dead until your team kills a Void Angel that spawns on the map.

It also has restrictions on what you can use, like a selection of three Warframes and nine different weapons, three for each slot. This further increases difficulty. Once you play through your first Deep Archimedea run, you unlock an even harder mode called "Elite Deep Archimedea", which applies up to three further negatives on your run and increases the difficulty even further but offers mostly great rewards.

I'll wait for the answer too. Got back into it 66 days ago(only to find out i deleted the email the acc was registered on so began from scratch).