| class learns at level 8 = Arcane Trickster, Eldritch Knight
| races =
| race learns at level 1 =
| race learns at level 2 =
| summary = This spell allows spellcasters to decrease a creature's body size. Affected creatures deal less damage with their weapons and have {{Disadvantage}} on [[Strength]] [[Ability Check|Checks]] and [[Saving Throw]]s.
| summary = This spell allows spellcasters to decrease a creature's body size. Affected creatures deal less damage with their weapons and have {{Disadvantage}} on [[Strength]] [[Ability Check|Checks]] and [[Saving Throw]]s.
Reduce decreases the Size category of the target creature by 1. This affects the maximum size of creature it can Throw or use as an Improvised Melee Weapon, and vice-versa. For example, a creature of Medium size can only be thrown by a Large or larger creature. When Reduced, a Medium creature becomes Small and can be thrown by a Medium creature.
While not stated in the spell description, Reduce also decreases the weight of the target creature. The formula used is:
Original Weight / 2.35 = New Weight (minus additional weight, if needed, to place creature in the correct size category)
The change in size from the spell stacks with the change in size from Disguise Self, making it possible to become a tiny creature (small race + Reduce). As a tiny creature it is possible to go through even the smallest of passageways such as pipes or jumping through the bars of a fence, something even the small races can't do.