Ward of dawn should be impenetrable, it's freaking description says indestructible sheild. 2 GG shots, 2-3 Hammers, Nova, FoH. It's so easy to kill a defender without even stepping foot inside his bubble.
Edit: Were trending, Crazy!!!
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An invincible bubble will destroy pvp. It'd make matches stagnate into a permanent meta of bubble palace. Offense has to be stronger than defense in a game like this.