Casting Time: 1 action
Range: 60 ft
Components: V, S, M
Duration: 1 hour
You summon a shadow demon that appears in an unoccupied space you can see within range. The shadow demon disappears when it drops to 0 hit points or when the spell ends. Roll initiative for the shadow demon, which has its own turns. You can issue orders to the shadow demon, and it obeys you as long as it can attack a creature on each of its turns and does not start its turn in an area of bright light. If either of these conditions is not met, the shadow demon Immediately makes a Charisma check contested by your Charisma check. If you fail the check, the spell no longer requires concentration and the demon is no longer under your control. The demon automatically succeeds on the check if it is more than 100 feet away from you. As part of casting the spell, you can scribe a circle on the ground using the blood of an intelligent humanoid slain within the past 24 hours. The circle is large enough to encompass your space. The summoned shadow demon cannot cross the circle or target anyone in it while the spell lasts.
Material Component:
a vial of blood from an intelligent humanoid killed within the past 24 hours
Verbal Component:
Invito Daemon Umbra
Classes: Sorcerer, Wizard, Rogue
Tags: Summoning
Source: Unearthed Arcana
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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).
