The Possessed

The Possessed are a new 1.3 enemy in the Solar Eclipse. They start out slow, but they can collect momentum to charge at you, like the Wolf enemy. Unlike Wolves, these enemies can crawl on walls, similar to spiders like the Wall Creeper or Black Recluse. Whats different from that is that they can still "run" fast on walls as if it was walking.

Trivia

 * The Possessed is a reference to the 1973 movie The Exorcist.