Polymorph

4th-Level Transmutation Spell (Bard, Druid, Sorcerer, Wizard)

Casting Time: Action
Range: 60 feet
Components: V, S, M (a caterpillar cocoon)
Duration: 1 hour

You attempt to transform a creature that you can see within range into a Beast. The target must succeed on a Wisdom saving throw or shape-shift into Beast form for the duration. That form can be any Beast you choose that has a

Challenge Rating (CR) summarizes the threat a monster poses to a group of four player characters. Compare a monster's CR to the characters' level. If the CR is higher, the monster is likely a danger. If the CR is lower, the monster likely poses little threat. But circumstances and the number of player characters can significantly alter how threatening a monster is in actual play. The Dungeon Master's Guide provides guidance to the DM on using CR while planning potential combat encounters. _Se ... [more]

equal to or less than the target's (or the target's level if it doesn't have a

Challenge Rating (CR) summarizes the threat a monster poses to a group of four player characters. Compare a monster's CR to the characters' level. If the CR is higher, the monster is likely a danger. If the CR is lower, the monster likely poses little threat. But circumstances and the number of player characters can significantly alter how threatening a monster is in actual play. The Dungeon Master's Guide provides guidance to the DM on using CR while planning potential combat encounters. _Se ... [more]

). The target's game statistics are replaced by the stat block of the chosen Beast, but the target retains its alignment, personality, creature type,

Hit Points (HP) are a measure of how difficult it is to kill or destroy a creature or an object. Damage reduces Hit Points, and healing restores them. You can't have more Hit Points than your Hit Point maximum, and you can't have less than 0. See also Breaking Objects and Damage and Healing.

, and

Hit Point Dice, or Hit Dice for short, help determine a player character's Hit Point maximum, as explained in Creating a Character. Most monsters also have Hit Dice. A creature can spend Hit Dice during a Short Rest to regain Hit Points. See also Short Rest.

.

The target gains a number of

Temporary Hit Points are granted by certain effects and act as a buffer against losing real Hit Points. See also Damage and Healing.

equal to the

Hit Points (HP) are a measure of how difficult it is to kill or destroy a creature or an object. Damage reduces Hit Points, and healing restores them. You can't have more Hit Points than your Hit Point maximum, and you can't have less than 0. See also Breaking Objects and Damage and Healing.

of the Beast form. These

Temporary Hit Points are granted by certain effects and act as a buffer against losing real Hit Points. See also Damage and Healing.

vanish if any remain when the spell ends. The spell ends early on the target if it has no

Temporary Hit Points are granted by certain effects and act as a buffer against losing real Hit Points. See also Damage and Healing.

left.

The target is limited in the actions it can perform by the anatomy of its new form, and it can't speak or cast spells.

The target's gear melds into the new form. The creature can't use or otherwise benefit from any of that equipment.

Source: Player's Handbook, p. 306