Gashadokuro (がしゃどくろ) is a large skeleton youkai born from a massive gathering of skeletons of those who died in war and those who didn't receive a proper burial. Gashadokuro wanders the night producing a "gachi-gachi (ガチガチ)" sound and will crush and devour any living human it sees.
Gashadokuro in Touhou
In Ten Desires during Sanae's extra stage, Sanae's idea on the youkai trump card was a gashadokuro (shortly disproven however). It is unknown whether there are any gashadokuro in Gensokyo or not.
- Wikipedia entry for Gashadokuro (No references or sources)