Shields are type of equipments in Elden Ring: Nightreign that is primarily used for guarding against damage, or parrying incoming enemies' attacks. Depending on attached Ash of War, Shields can also execute skills, which can further increase defensive capabilities, or inflict damage. You can find this equipment randomly in the world of Limveld, or get them as a reward for slaying bosses.
NightreignShields - Nightreign Wiki

Albinauric Shield
Medium Shield • Lvl Required 1
Weapon Skill: Parry
Use this skill in time with a foe's melee attack to deflect it and break that foe's stance. This provides an opening to perform a critical hit.
Tall oval shield made of metal carried by young Albinaurics. The ornamentation represents the primordial drop of dew from which they are said to have been created. Boasts exceptional magic damage negation. The Albinaurics' most formidable foes were sorcerers, after all.

Ant's Skull Plate
Greatshield • Lvl Required 1
Weapon Skill: Shield Bash
Brace behind shield before using bodyweight to ram foes while maintaining guarding stance. Weaker enemies will be shoved backwards, and can even be staggered.
Huge head of one of the giant ants which inhabit the two underground rivers, used without modification as a shield. Excels at repeling enemy attacks. Giant ants are venomous creatures.

Banished Knight's Shield
Medium Shield • Lvl Required 1
A tall medium-sized metal shield. Given to knights who, whether by misfortune or misdeed, were forced to abandon their homes. Most of these knights were sent to the fringes, where they were forced to start anew with only despair for company.

Beast Crest Heater Shield
Medium Shield • Lvl Required 1
Weapon Skill: Parry
Use this skill in time with a foe's melee attack to deflect it and break that foe's stance. This provides an opening to perform a critical hit.
A medium-sized metal shield. Easier to handle than a kite shield. Features a beast as its crest, serving to remind warriors not to succumb to the arousal of battle. Fight with passion, but become not its prisoner.

Beastman's Jar-shield
Medium Shield • Lvl Required 1
Shield fashioned from a tall broken jar carried by the beastmen of Farum Azula. There is a particular knack to wielding it. The beastmen have always fired earthenware jars for the express purpose of making shields. Such are their ways, strange though they are.

Black Leather Shield
Medium Shield • Lvl Required 1
Roundshield covered in black leather. On the larger side for a medium-sized shield. From the north, this shield depicts the polar star in rivets of gold. The inside is lined with fur, protecting the carrier from frost.

Blue Crest Heater Shield
Medium Shield • Lvl Required 1
Weapon Skill: Parry
Use this skill in time with a foe's melee attack to deflect it and break that foe's stance. This provides an opening to perform a critical hit.
A medium-sized metal shield. Easier to handle than a kite shield. The crest represents a forest and river.

Blue-gold Kite Shield
Medium Shield • Lvl Required 1
Weapon Skill: Parry
Use this skill in time with a foe's melee attack to deflect it and break that foe's stance. This provides an opening to perform a critical hit.
A standard medium-sized shield. Highly reputed for its solid build and reliability. The design represents the Erdtree foreground against a blue sky.

Blue-white Wooden Shield
Small Shield • Lvl Required 1
Small wooden roundshield that has been reinforced with metal. It is light and easy to handle, but cannot offer the damage negation of a true metal shield. The design is said to represent the stars of the night sky, portending fate.

Brass Shield
Medium Shield • Lvl Required 1
On the larger side for medium-sized shield, the face has been covered in brass. Commonly employed in the Shattering.

Briar Greatshield
Greatshield • Lvl Required 1
Weapon Skill: Shield Bash
Brace behind shield before using bodyweight to ram foes while maintaining guarding stance. Weaker enemies will be shoved backwards, and can even be staggered.
Greatshield from a foreign land, used by Elemer of the Briar. Attacks with this armament utilize the iron thorns that have been wound around its frame. Originates from Eochaid, a land of proudly solitary ascetics.

Buckler
Small Shield • Lvl Required 1
Weapon Skill: Buckler Parry
Use this skill in time with a foe's melee attack to deflect it and break that foe's stance. This is faster than a regular parry.
A small metal roundshield. The bump in the center is designed to parry. A well-timed parry deflects an enemy's attack, breaking their stance and leaving them open to a critical hit. Though risk is inherent, this shield favors aggression.