It's not that we killed his son, he doesn't care about that pushover. No, something very precious of his was destroyed in the black garden. Something that no one can ever give him again. Something he cherished and held dear for many centuries.. His ballsack. That's right guardians, what we were told is the heart of the black garden was actually Oryx's nuts. He wants revenge. But he can't come for it. ;)
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Thought it was because we essentially committed breaking and entering and proceeded to murder the hive we saw just to steal his stuff to sell on guardian black market.