As an action, you can create a vial of liquid that optically appears bigger or smaller than it actually is. A creature can drink the contents as an action to change its appearance, gaining an illusory appearance.
The effect disguises physical appearance as well as clothing, armor, weapons, and equipment. The creature can choose to seem 30 centimeters shorter or taller and appear thin, fat, or in between. The creature can’t change its body type, so it must choose a form that has the same basic arrangement of limbs. Otherwise, the extent of the illusion is up to the creature. The effect lasts for the duration, unless the creature uses its action to dismiss it sooner.
The changes wrought by this effect fail to hold up to physical inspection. For example, if this effect is used to add a hat to a creature’s outfit, objects pass through the hat, and anyone who touches it would feel nothing or would feel the creature’s head and hair. If this effect is used to appear thinner than the creature is, the hand of someone who reaches out to touch the creature would bump into it while it was seemingly still in midair.
A creature can use its action to inspect a target and make a Will saving throw against your alchemical save DC. If it succeeds, it becomes aware that the target is disguised.