The Elder Scrolls: Tamriel

You dampen the sound of your movements or those of a creature you touch, making them nearly silent. For the duration, the target has advantage on Dexterity (Stealth) checks to move silently, and creatures that rely on hearing have disadvantage on Perception checks to detect them. The spell lasts for up to 1 hour or until the target makes a loud noise, such as casting a spell with verbal components or attacking.