Atheon
Edit: or vex mythoclast. Not sure. The "what" kind of throws me.
English
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"his mistakes" "What"
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Exactly. "His" makes my think a being but the "what" in the question makes me think an item.
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Yes, but that's why I said "his mistakes" "We will use his mistakes" This is kind of a hint I guess, but I'm talking about [i]his[/i] mistakes.
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Yeah, riddles have clues in them, the reference to a being by using his, him, he. The reference to vex things like conflux. The blindly marching could refer to teleporting in the battle against atheon. The first raid boss could be who needs to die before us. Honestly I have never read a single grimoire card so I'm going purely off what is contained in the riddle and my in game experience.