Casting Time: 1 action
Range: 90 ft
Components: V
Duration: Instantaneous
Damage Type: Thunder
Save: Constitution
You teleport yourself to an unoccupied space you can see within range. Immediately after you disappear, a thunderous boom sounds. and each creature within 10 feet of the space you left must make a Constitution saving throw, taking 3d10 thunder damage on a failed save, or half as much damage on a successful one. The thunder can be heard from up to 300 feet away.
You can bring along objects as long as their weight doesn’t exceed what you can carry. You can also teleport one willing creature of your size or smaller who is carrying gear up to its carrying capacity. The creature must be within 5 feet of you when you cast this spell, and there must be an unoccupied space within 5 feet of your destination space for the creature to appear in; otherwise, the creature is left behind.
When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd.
Verbal Component:
Instans Eo Pedes Tonitrua
Classes: Sorcerer, Warlock, Wizard, Rogue
Domain: Travel
Tags: Damage, Teleportation
Source: Xanathar's Guide to Everything (page 168)
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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).
Underwater - Thunder Effects
None of the thunder spells mention water interaction in any way. In addition, the section in the PHB about underwater combat (pg. 198) doesn't mention anything about thunder spells behaving differently in water. So officially, there are no rules amplifiying or diminishing the spell effects. In addition, Jeremy Crawford has made a comment regarding a fireball in water that relates to this subject, "Nothing in the rules causes a fireball to vaporize water. Magic ≠ physics. DMs may apply whatever magical/scientific logic they like."
