Destiny 2’s Atlas Skews are part of the Tracing the Stars I questline, where you’ll be exploring the Dreaming City in search for them.
Debuting in Season of the Lost, this is one of the first quests you can activate and start progressing through during your visits to the Dreaming City. The main objective is to find five Atlas Skews around the map.
This also leads to a secondary quest that you must complete to finish Tracing the Stars I. As a reward for your troubles, you’ll obtain a shiny new hand cannon.