How do you mean disappeared? Can't see it in the viewport as the animation plays, nothing in Playblast, doesn't render when you render the frames?

Darkon

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Red bellows of flame have blackened my stones
Convulsing my frame and cracking my bones
Hell's dragons of steel who roar in their chains
Crawl into my caves to suck out my veins.....

-The Mountain P.F.M.