Item Type: Potion

Item Rarity: Rare

Requires Attunement: No

D&D Beyond: Potion of Gaseous Form

Source: Dungeon Master’s Guide

Consumable: Yes

When you drink this potion, you gain the effect of Gaseous Form for 1 hour with no Concentration required, or until you end the effect as a Bonus Action.

The container seems to hold fog that moves and pours like water.