User blog comment:V3hemenc3/Runic Bulwark and who on your team should build it/@comment-4124337-20130201173306/@comment-5002283-20130201201239

The item is cost efficient without the aura (that is the aura part only on yourself).

So two bulwarks isn't bad; the two people who have it have both a good costefficient allround defence item and if one off them died (considering they probably will be initiators it;s rather likely), then the team can still benefit from the aura from the other person.