The Attractor is a crafted noisemaker that draws nearby Freakers to it. You learn it after Do You Have My Back?. Use it to pull Freakers away or onto traps and bombs.
Throw it to clear a path or pull a pack onto a Proximity Bomb or Remote Bomb. It even works on Horde Swarmers, unlike rocks.
The Attractor Bomb kills what it gathers. The plain Attractor is cheaper and better for steering enemies. Carry both if parts allow.