While not necessary to get there, some gameplay features are worth unlocking beforehand. Two of those recommendations include Archwings and K-Drives, which provide a faster way to get from point A to B and a gorgeous top-down look at the huge, detailed world below. We recommend spending time in both Plains of Eidolon and Fortuna to see why Deimos’ geography is so vastly different from the other open worlds. Though it’s not necessary to access Deimos, you’ll need to have completed the Second Dream cinematic quest and discovered its secrets to use the Necramechs.