Warning Shout

2nd-level · Divination

Casting Time 1 reaction, which you take immediately before initiative is rolled

Range 30 feet

Components V

Duration Instantaneous

Classes Bard, Cleric, Paladin, Wizard

You sense danger before it happens and call out a warning to an ally. One creature you can see and that can hear you gains advantage on its initiative roll.

Source: Deep Magic 5e · OGL/Open