殉 is a Japanese kanji written with 10 strokes, listed here under the keyword “martyrdom”. It is built from 旬 (decameron) and 歹 (death). In Remembering the Kanji by James W. Heisig it is frame 872.
On KumiJi Glyph Explorer, open the parts search and type “decameron” + “death”. 殉 is among the results, together with every other character containing the same shapes.
Open 殉 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.