Crazyashellndslice
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It's not a matter of the ability being useless it's a matter of circumstance. It's just like saying Lumians fire ability is useless cause he's fighting an enemy under water and can't put the full effect of his ability to use.
He didn't syphon all of it only half a years worth but that was enough to cause the ritual to fail since the ring needs a years worth to work.
What if he's the child that escaped from cordo?