Casting Time: 1 minute
Range: 60 ft
Components: V
Duration: 30 days
Damage Type: Psychic
Save: Wisdom
Conditions: Charmed
You place a magical command on a creature that you can see within range, forcing it to carry out some service or refrain from some action or course of activity as you decide. If the creature can understand you, it must succeed on a Wisdom saving throw or become charmed by you for the duration. While the creature is charmed by you, it takes 5d10 psychic damage each time it acts in a manner directly counter to your instructions, but no more than once each day. A creature that can't understand you is unaffected by the spell.
You can issue any command you choose, short of an activity that would result in certain death. Should you issue a suicidal command, the spell ends.
You can end the spell early by using an action to dismiss it. A remove curse, greater restoration, or wish spell also ends it.
When you cast this spell using a spell slot of 7th or 8th level, the duration is 1 year. When you cast this spell using a spell slot of 9th level, the spell lasts until it is ended by one of the spells mentioned above.
Verbal Component:
Voluntas Mandatum
Classes: Bard, Cleric, Druid, Paladin, Wizard
Domain: Charm
Tags: Charm
Source: Player's Handbook [5th Edition] (page 244)
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Other Planes and Effects
Below is information about this spell as it relates to other planes and area of effects (i.e. underwater). Some of the information is pulled official D&D sources (such as books and the twitter feeds of D&D officials), but other information is derived from forums and online discussions. As always, it is up to the DM to decide how they wish to handle spell effects.
Underwater - Verbal Component
Official rules have been verified by Jeremy Crawford - "No rule prohibits verbal components from working underwater. Keep in mind that if you're talking, you're not holding your breath." Hence, while submerged underwater and holding its breath, a creature can cast a spell that requires a verbal component. After casting the spell, if the creature can't breathe underwater, it immediately runs out of breath. The creature can survive for a number of rounds equal to its Constitution modifier (minimum of 1 round).