Stowaway

Stowaways are a stationary predator exclusive to the Downpour DLC. They reside in dim underground areas, and acquire prey through ambush.

Appearance
The main body is relatively small, and mimics the texture and appearance of pipes its attached to. Before triggered, their body is shrunken into their perch on the ceiling, with long grey tendrils reaching down to the floor, acting as sensors. When triggered, the main body suddenly juts out and opens its maw, revealing 5 jagged faded pink teeth. 3 Long pinkish grey tentacles will drop down, almost quadruple the size of the main body. These tentacles each have a jagged hook at the end.

Combat
Fighting against Stowaways can be very tricky, as they're near invisible ambush predators with a fast attack, however, you can dispatch a stowaway before its ambush is activated.

Trivia

 * The stowaway is one of the 3 Downpour creatures to not have an arena unlock