Brain Suckler

Brain Suckler is a flying enemy spawned by the Nebula Pillar during the Lunar Events. It can latch onto the player's head, greatly reducing vision (such as Blackout or Darkness) and dealing large amounts of damage.

Trivia

 * It appears to be a reference to the 'Brain Sucker' alien from XCOM: Apocalypse, metroids from the Metroid series, and the 'Headcrab' enemy from the Half Life games as it drops the Nebula Headcrab banner and has a similar attack (Headcrabs jump to a persons head and take over the nervous system while Brain Sucklers latch onto someone's head and inflicts a debuff).

History
Suceur de Cerveau