The damage bonus from this guild is invaluable. But another huge perk is that you get Bash level 15. This appears to greatly increase success with spellcasting in combat, as you have to bash your enemy away before casting.
A pause from Barbarian's Guild to share wisdom from days of old:
Today is: 6th December (GMT), in history on the 6th of December, 1992 AD the following death happened:
Percy Herbert: Actor (Captain Apache), dies of heart attack at 72