Level 1 •
Casting Time: 1 action
Components: V, S, M
Duration: 1 hour
For the duration, you understand the literal meaning of any spoken language that you hear. You also understand any written language that you see, but you must be touching the surface on which the words are written. It takes about 1 minute to read one page of text.
This spell doesn't decode secret messages in a text or a glyph, such as an arcane sigil, that isn't part of a written language.
a pinch of soot and salt
Verbal Component (Alternative):
By these words, your speech I intend, to become more clear, that I may comprehend. Classes:
Bard, Sorcerer, Warlock, Wizard, RogueTags:
Communication, SocialSource: Player's Handbook [5th Edition] (page 224)
View Comprehend Languages Spell Card
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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).