Poo's Master is a character in EarthBound, who was responsible for giving Poo his Mu training. He is found in Dalaam, occupying the throne room of Poo's palace. Poo's Master doesn't have a name in English, but is known as "Yee-soo-chii" in the Japanese version. This is derived from the Chinese "Yi-Si-Qi" (one-four-seven); a reference to a gameplay concept in mahjong.

Once Poo joins Ness' party, talking to Poo's Master has the same effects as staying at a Hotel.

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