暗 is a Japanese kanji written with 13 strokes, listed here under the keyword “darkness”. It is built from 音 (sound) and 日 (day). In Remembering the Kanji by James W. Heisig it is frame 519.
On KumiJi Glyph Explorer, open the parts search and type “sound” + “day”. 暗 is among the results, together with every other character containing the same shapes.
Open 暗 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.