So I tested in the raid with a friend, [b]1027[/b] crit from Fatebringer on a Thrall, and [b]427[/b] on a Major Knight
He hit [b]1037[/b] on the Thrall and [b]437[/b] on the Major Knight
+10 more damage WITH hive disruptor
Fatebringer has greater impact which even with Word of Crota being 331 it's pretty much just an Atheons Epilogue replacement for burns.
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Have you maybe considered that your friends word if crota is not maxed at 331? The word starts at 300 atk and the Fatebringer maxes at 300. Do you see a pattern?