by Sevenless » Wed Sep 16, 2015 12:59 pm
Because you said "bats" and not "bat". When multiple mobs attack you all at once, their damage is added together. Instead of getting 4 fell slashes or whatever, they combined into a single much more serious wound. As to why you can't heal it: Jorb hasn't fully decided how to handle serious wounds. He doesn't want us thinking that they will be easy or convenient to heal though. As such the damage is permanent right now.
Moral of the story is never go near a cluster of bats. Even on crawl speed their chance to aggro isn't worth it.