I've been trying KBD since i had a black dragon task. I seem to be able to kill him easily, but when i hopped a world, she suddenly started to hit me for 2000-3000 per attack, and i died cause i wasn't prepared. Im sure i still had my antifire (Regular) active. (Im using dual Drygore, with Normal antifire + Magic protect) Every kill, she doesn't hit me for more then ~800, but when i hopped she killed me in 3 seconds. Why?

Antifire wears off when you log out.

 

Also the King Black Dragon is a guy

Woops on the he-she thing :P But i still had the antifire icon active?

I just did some research on this. His max hit with fire breath is about 4k. Antifire reduces damage by 50%, which is consistent with what you experienced. Protect from magic also reduces damage by 50%, which would reduce the damage to about 1k, which is also consistent. So either you forgot to activate protect from magic or antifires don't persist after log out.

I guess it was prayer then.. Time to get Supers lol