For the colossal sized titan that’s supposed to have such legendary feats of strength in the lore sure would be cool to see him have even a minor role other than a crucible mascot before this is all over with. Bigger issues to worry about, of course, but just a thought.
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I don't think Shaxx has ever had any meaningful story involvement. As far as I can remember, his only non-Crucible dialogue after the Red War was the chat with Saint in the Devil's Ruin quest.