魔 is one of the most commonly used Japanese kanji, and it also has a lot of special readings in addition to the standard onyomi and kunyomi readings.
ONYOMI 音読み
KUNYOMI 訓読み
マ ma
Examples
株式市場は魔の市場だとよく言われる。The stock market is often called a dangerous one.まずいよ。また遅刻だ!!はやくも遅刻魔の異名をとってしまう。Oh no! I’m late again!! I’m going to get the nickname ‘King of Late arrival’.好事魔多し。Happy events tend to be accompanied by problems.