Casting Time: 1 action
Range: 60 ft
Components: V
Duration: 1 round
Save: Intelligence
You drive a disorienting spike of psychic energy into the mind of one creature you can see within range. The target must make an Intelligence saving throw. Unless the saving throw is successful, the target takes 1d6 psychic damage, and the first time it makes a saving throw before the end of your next turn, it must roll a d4 and subtract the number rolled from the save.
This spell's damage increases by 1d6 when you reach certain levels: 5th level (2d6), 11th level (3d6), and 17th level (4d6).
Verbal Component:
Mentis Lambero
Classes: Bard, Sorcerer, Warlock, Wizard, Rogue
Tags: Damage, Psionic
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.
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).