Guild Wars 2

I’m really excited for Guild missions but here is my question:

Are each guild missions a buyable event-chain that Guildmates have to move through in order to finish the guild mission?

Or is Guild mission a buyable one-time dynamic event?

We don’t know alot about them(yet), but as far as I know, your guild will research a mission, when activated it will launch a banner anywhere in PvE(like the extra karma banner) everyone(including non-guildies) can join the instance that way,the objective is to get a set amount of people trough the objectives, if you do that everyone gets a reward, the guildies get a extra reward and the guild itself gets a currency used to buy guild-wide beneftits, like reduced WP-travel