Board Thread:Game Discussions/@comment-25098784-20140624040641/@comment-24738360-20140624155350

Yes, as the others said, Guild's do give boosts.

You do get boosts for being a certain rank in a guild.

High Commander:: 5% Boost to Attack/Defense

Guild Sentinel, Guild Champion, and: 7% Boost to Attack/Defense

Guild Master: 10% Boost to Attack/Defense

You can also get elemental bonus' in a guild for each element, the maximum for that is 10% each element.