The second act of Destiny 2’s first new episode, Echoes, adds two new guns to the list of weapons you can acquire from the episode’s activities. Like other episode weapons, you can eventually earn the ability to buy those two guns from Failsafe, the Echoes vendor. However, the ability to “focus” Echoes engrams into Aberrant Action or Corrasion isn’t immediately available with the launch of the episode. Instead, you have to earn it as a vendor upgrade by completing Failsafe’s tasks.
The ability to unlock focusing for Aberrant Action and Corrasion are now available as of Week 9, with the lengthy Specimen ID: NES005 mission coming into the game. It’ll eventually give you the vendor upgrade for Failsafe you need to earn these new guns, but there are a few long, grindy steps involved.
Both guns are pretty notable: Aberrant Action is a rocket-assisted sidearm and just the third of that type of gun in the game, while Corrasion is a heavy pulse rifle that has a different feel from just about any other pulse. That makes being able to secure god rolls on them through focusing or crafting an enticing proposition.