おかげ
help, thanks to
The help came from the shaded side where you could not see it happening, and you passed because of it. The same cage かげ of shadow as 影, and somebody was working away inside it: おかげ.
お陰で is thanks to and お陰様で is the set phrase for saying you are well because of others. 手伝う てつだう is helping with a task, where お陰 is the help you credit afterwards.
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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.