30 ft Components:
V, S, M
User Created: This is an unofficial, user-created spell.
Check with your DM about using this spell.
You conjure a small toxic cloud of billowing poison centered on a creature within range that you can see. The creature must succeed on a Constitution save or take 1d4 poison damage and have disadvantage on the next attack roll it makes before the end of its next turn. Creatures immune to the poisoned condition are unaffected.
This spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).
a drop of adder poison
Quaeso Nimbus Toxicum Classes:
Bard, Druid, Sorcerer, Warlock, Wizard, RogueDomain:
View Toxic Cloud 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).