What is Odyssey Extraction

Odyssey Extraction is well done mode that is ruined by the stupid missions...Not to mention you play over and over to unlock the augments thinking I will clear it much faster I will be OP and then you see the missions and realize that Riot tells you to use only 2 augments or you won't get that free Masterwork Chest that is probably worth nothing, haha nice joke Riot but we are far from 1st April...