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The Age of Conan team has published a handy-dandy FAQ on the topic of server merges coming to the game as devs prepare it for its freemium iteration later this summer. The FAQ details several important questions players might have including characters with the same name on merged servers and issues facing guilds.
And what will happen with guild battlekeeps?
Since build spots for battlekeeps are limited on each server, all build spots will be cleared and guilds will be reimbursed the resources for their battlekeep. This is to make sure that the guild get the needed resources again and every guild gets the same chance.
Read more on the Age of Conan forum.