Casting Time: 1 action
Range: 60 ft (10 ft
)
Components: V, S, M
Duration: 1 minute
Save: Dexterity
Conditions: Prone
Slick grease covers the ground in a 10-foot square centered on a point within range and turns it into difficult terrain for the duration.
When the grease appears, each creature standing in its area must succeed on a Dexterity saving throw or fall prone. A creature that enters the area or ends its turn there must also succeed on a Dexterity saving throw or fall prone.
Material Component:
a bit of pork rind or butter
Verbal Component:
Oleum Arvina
Verbal Component (Alternative):
Oil of earth I now release, to coat this ground with a slick coat of grease
Classes: Wizard, Rogue, Artificer
Source: Player's Handbook [5th Edition] (page 246)
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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).