Did you even look at your own numbers? -blam!-ing merciless does more damage than xenophage according to you. Even edge transzit does more damage. How would a 50% pve damage buff make it the go to option if there are better damage options?
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Xenophage is 285,000 damage. Multiply that by 1.5 for a 50% increase in damage. That's 427,500, which is higher than every option besides Izanagi & L&D.