Casting Time: 1 action
Range: 30 ft
Components: V, S, M
Duration: Instantaneous
Damage Type: Poison
Save: Constitution
You cause mites, fleas, and other parasites to appear momentarily on one creature you can see within range. The target must succeed on a Constitution saving throw or take 1d6 piercing damage. If the target takes any of that damage, the target moves 5 feet in a random direction. Roll a d8 for the direction: 1, north; 2, northeast; 3, east; 4, southeast; 5, south; 6, southwest; 7, west; or 8, northwest.
The spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).
Material Component:
a living flea
Verbal Component:
Sie Nimbus Infestare
Verbal Component (Alternative):
A plague of bugs, a wriggling batch.
Creep and crawl, itch and scratch;
Classes: Druid, Sorcerer, Warlock, Wizard, Rogue
Tags: Damage, 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).
