Casting Time: 1 minute
Range: 90 ft
Components: V, S, M
Duration: Concentration
, up to 1 hour
Uttering a dark incantation, you summon a devil from the Nine Hells. You choose the devil's type, which must be one of challenge rating 6 or lower, such as a barbed devil or a bearded devil. The devil appears in an unoccupied space that you can see within range. The devil disappears when it drops to 0 hit points or when the spell ends.
The devil is unfriendly toward you and your companions. Roll initiative for the devil, which has its own turns. It is under the Dungeon Master's control and acts according to its nature on each of its turns, which might result in its attacking you if it thinks it can prevail, or trying to tempt you to undertake an evil act in exchange for limited service. The DM has the creature's statistics.
On each of your turns, you can try to issue a verbal command to the devil (no action required by you). It obeys the command if the likely outcome is in accordance with its desires, especially if the result would draw you toward evil. Otherwise, you must make a Charisma (Deception, Intimidation, or Persuasion) check contested by its Wisdom (Insight) check. You make the check with advantage if you say the devil's true name. If your check fails, the devil becomes immune to your verbal commands for the duration of the spell, though it can still carry out your commands if it chooses. If your check succeeds, the devil carries out your command — such as "attack my enemies," "explore the room ahead," or "bear this message to the queen" — until it completes the activity, at which point it returns to you to report having done so.
If your concentration ends before the spell reaches its full duration, the devil doesn't disappear if it has become immune to your verbal commands. Instead, it acts in whatever manner it chooses for 3d6 minutes, and then it disappears.
If you possess an individual devil's talisman, you can summon that devil if it is of the appropriate challenge rating plus 1, and it obeys all your commands, with no Charisma checks required.
When you cast this spell using a spell slot of 6th level or higher, the challenge rating increases by 1 for each slot level above 5th.
Material Component:
a ruby worth at least 999gp
Verbal Component:
Vocantem Infernalis
Classes: Warlock, Wizard
Tags: Summoning
Source: Xanathar's Guide to Everything (page 158)
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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.
Summoning in Sigil
From Planescape Adventures in the Multiverse, Sigil and the Outlands, "With the exception of permanent teleportation circles, the Lady of Pain prevents spells and other powers from allowing anything to enter the City of Doors. That means creatures and objects from outside in the multiverse can't be summoned or conjured into Sigil by any means. Summoning abilities a character might have, such as the conjure elemental spell or a class feature that summons a companion, still function as normal with these features calling only creatures that exist somewhere within Sigil itself."
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).