It was hard to leave the place where you grew up and lived all your life. The devotees wouldn't do that without first seeing the horde of monsters.
They did that because of their blood mark, but because of their faith in Arthur. A few days ago, they received the first blessing, and that took out the doubts from their hearts as they truly accepted Arthur.
The blessing improved the overall strength of all warriors, but not only that. Each person received something unique, and the people that did the most for the faith, such as praying more or spreading the word, received better bonuses.
That made them eager to spread the word of Arthur's power, and after centuries, someone was finally doing something for them, unlike the silent totems that disappeared a long time ago.
Arthur was happy with that, as it also increased his strength as attributes, which could be increased indefinitely. Speaking of each, Arthur had tons of points to use.
[Name: Arthur Willians]