User blog comment:V3hemenc3/Runic Bulwark and who on your team should build it/@comment-4124337-20130201173306

When you say your team should have "at least one" i think you mean one... it doesn't stack and the benefits can be gained from cheaper items as well as the aura from the one person who does buy it. I think the tank would normally buy it unless the support has high initiation ability and defense such as taric or leona (although leona would probably be the tank).