From the Super Mario Wiki
Gloom is one of the Vibes that Princess Peach can use in Super Princess Peach. It is used by pressing the blue heart, which causes Peach to start crying. Her tears turn into strong spouts, which can be used to grow plants. She can also run faster and jump higher. It is used to defeat some bosses such as Petey Piranha. Also, the music gets 2 times slower when Princess Peach uses this vibe.
Gloom can also be used by King Boo when his health is lowered to 2 HP, which can be used to put out the candles scattered around the arena Princess Peach and King Boo fight in.
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