Minecraft wiki entry for Vex, associated text: Vexes are capable of flying through the air, and can freely pass through any block, including water and lava, without taking damage. Vexes can pass through bedrock, meaning it's possible for them to die in the void. While vexes can pass through blocks easily, honey blocks seem to slow them down. Vexes also can be bounced back when pushed by a slime block. While attacking, they glow red and lunge at their target.