Casting Time: 1 action
Range: 150 ft (60 ft
)
Components: V, M
Duration: Concentration
, up to 10 minutes
Damage Type: Psychic
Save: Wisdom
Magical darkness spreads from a point you choose within range to fill a 60-foot-radius sphere until the spell ends. The darkness spreads around corners. A creature with darkvision can't see through this darkness. Nonmagical light, as well as light created by spells of 8th level or lower, can't illuminate the area.
Shrieks, gibbering, and mad laughter can be heard within the sphere. Whenever a creature starts its turn in the sphere, it must make a Wisdom saving throw, taking 8d8 psychic damage on a failed save, or half as much damage on a successful one.
Material Component:
a drop of pitch mixed with a drop of mercury
Verbal Component:
Sie Insanio Noxito
Classes: Warlock, Wizard
Domain: Madness
Tags: Damage
Source: Xanathar's Guide to Everything (page 160)
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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).
