なくなる
to be lost, to be used up
The whole lot burnt away to nothing, with なる the turning into. Bill Nye な has vanished mid-sentence again, and where it went has stopped being the interesting question: なくなる.
Used up or gone missing, both. Careful with 亡くなる なくなる, identical in speech, which is the polite word for somebody dying.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.