User blog comment:Lia Schiffer/399: Deicide/@comment-1755153-20100410010224

Well even though Itto Kaso was called the "Sacrificial spell" you can still sacrifice something without it being you're life. If you think about it, it's not too farfetched, well not the complete earth's core but just being able to create massive attacks using lava from beneath the earth.
 * Sudden Idea* what if he's planning a huge flaming eruption using his Bankai, I got the idea from what XxeroWolf said.