Feel free to apply for Centurion, we can always use someone active, someone with good ideas, as well as leadership skills, which are crucial. Even if you fail as a Centurion, you can always apply again, and correct the mistakes you've made the first time. You've been a member for a long time, you have proven loyalty to the guild, I'd strongly suggest you to apply for Centurion. I don't know how active you are in game, but if you are, you should apply.
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