The effects of the Obstructed debuff.
The 吮脑怪 is a 困难模式, post-拜月教邪教徒 flying 敌怪 spawned by the 星云柱 during the 月亮事件. It latches onto the player's head, dealing large amounts of damage at a steady rate, while also inflicting the 阻塞 debuff for the remainder of it time it is on the player.
- If the player teleports using a 魔镜, 冰雪镜, or a Cellphone while a Brain Suckler is still attached to them, the Brain Suckler will teleport with the player to the player's teleport-ed destination.
- Brain Sucklers pay homage to the iconic Headcrab enemy from the Half-Life series, as they attack by latching onto a player's head and disrupting their brain functions. Brain Sucklers are referred to as Nebula Headcrabs sporadically in the game's code, and in their banner prior to a patch, implying their name was changed at some point during development.
- They are also similar in appearance and function to the Metroids from the series of the same name, in that they latch onto preys' heads and drain their life force.
??：Name changed from "Nebula Headcrab" to "Brain Suckler".