From publisher blurb:
The brutal Destroyers are the Vanguard of invaders from the Sagittarius Galaxy sent to wipe out sentient life in the galaxy. For thousands of years they have attacked mining outposts, colonies, and civlization in general. Stronger than powered armor they are menacing in melee, and effective at range with their powerful Plasma Cannon and Grenade Launcher.
The Adversaries series delivers monsters you can use in your Starfinder campaigns.
This booklet contains:
The Plasma Destroyer: a CR 10 creature, including a full stat block, four monster knowledge blocks, each delivering new information at an increasing difficulty. Expanded ecology information about the Destroyers including the Hot environment specialist the Plasma Destroyer.