The Guildmaster can be very annoying, always bugging you about quests,a nd worst of all: your combat multiplier. Perosnally, I've never seen a difference from when it was 0 or 50. To shut him up, you need a combat multiplyer of 30 or more. To get this, you need to have defeated Maze, and be on the way to stop Jack from unleashing the power of the focus sites all over Albion. Here, there are unlimited and in most cases easy enemies. Just kill one afdter another. In time, you'll have a combat multiplier of 30. Guildmaster shoudl say "I see you've MASTERED the combat multiplier." You won't get any stupid messages after that.