Quick and easy
Draw a curve from the bottom curve to the top curve, choose the bottom curve and shift select the vertical curve you just made, then extrude. Next choose the bottom curve, go to Surface/Planar, then do the same for the top curve. There's lots of ways to do it, that's just the first one that came to mind
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.