Buff the bubble, it's useless both in pvp and pve.
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I popped a lot of bubble's in D1.. made orbs as crazy in PVE and gave some extra punch or protection for my buddies to carry with them in PVP. Now have only popped a bubble once in PVE and once in PVP.. utterly useless.. I rather go with striker or even the hammer for that matter before shield.. and bubble? hell no!