Tongues

3rd-Level Divination
Casting Time: 1 action
Range: Touch
Components: VM (a small clay model of a ziggurat)
Duration: 1 hour

This spell grants the creature you touch the ability to understand any spoken language it hears. Moreover, when the target speaks, any creature that knows at least one language and can hear the target understands what it says, as your voice reverberates with a supernatural wisdom.

At Higher Levels. When you cast this spell using a spell slot of 5th level 6th level, the duration is 8 hours. When you cast this spell using a spell slot of 7th or 8th level, the duration is 24 hours. When you cast this spell using a spell slot of 9th level or higher, the duration is 10 days.

Source: PHB 283, SRD

Changelog

Altered spell effect to have a clearly supernatural effect when active.
Added upcasting option.