Curved Greatswords in Elden Ring: Nightreign offer both decent damage and staggering capabilties, with its moveset being great for hitting multiple enemies. These weapons balance raw power with fluid motion, making them ideal for builds that focus on aggressive, mid-range combat. However, their stamina consumption and slower swing speed require good positioning and timing.
NightreignCurved Greatswords - Nightreign Wiki

Beastman's Cleaver
Curved Greatsword • Lvl Required 3
Curved greatsword of colossal size forged of dull iron and wielded by the beastmen of Farum Azula. The blade is incredibly heavy, but well-balanced. Comparatively easy to wield for the damage it delivers. It's clear the beastmen possess knowledge beyond human ken.

Bloodhound's Fang
Curved Greatsword • Lvl Required 3
Weapon Skill: Bloodhound's Finesse
Slash upwards with the Bloodhound's Fang, using the momentum of the strike to perform a backwards somersault and gain some distance from foes. Follow up with a strong attack to perform the Bloodhound's Step attack.
Curved greatsword with a gently undulating blade wielded by Bloodhound Knights. A fearsome blade capable of brutal airborne attacks.

Dismounter
Curved Greatsword • Lvl Required 1
This curved greatsword wielded by the brawny sellswords of Kaiden combines the blades of a scimitar with the heft of a hatchet. A difficult to handle weapon that demands much of the wielder's strength and dexterity, but with practice and ability, it can serve as a versatile weapon even on horseback.

Magma Wyrm's Scalesword
Curved Greatsword • Lvl Required 7
Weapon Skill: Magma Guillotine
Grab the scalesword with both hands, as a wyrm would hold it in its mouth, and leap forwards, smashing it into the ground and triggering a blast of magma. Follow up with an additional input to perform a chopping attack.
Curved greatsword wielded by Magma Wyrms. The shape resembles a dragon's jaw and is covered in hard scales. It's said these land-bound dragons were once human heroes who partook in dragon communion, a grave transgression for which they were cursed to crawl the earth upon their bellies, shadows of their former selves.

Monk's Flameblade
Curved Greatsword • Lvl Required 3
Curved sword with a flickering flame motif. Wielded by the Fire Monks who came from the Mountaintops of the Giants. The monks came to the land of Liurnia in pursuit of a fugitive who stole their fire.

Morgott's Cursed Sword
Curved Greatsword • Lvl Required 10
Weapon Skill: Cursed-blood Slice
Brace, then charge forward to deliver a downward diagonal slice. The bloody trail of the late is followed by a burst of flame. Additional input allows for a follow-up attack.
Unique Weapon Passive: Power of the Omen King
Warped blade of shifting hue used by Morgott, the Omen King. The accursed blood that Morgott recanted and sealed away reformed into this blade.

Omen Cleaver
Curved Greatsword • Lvl Required 3
Heavy-bladed curved sword of colossal size awarded to Omen as a tool of war. This weapon is made to take advantage of brute strength. The pattern etched upon the blade is the remnant of a deteriorating malediction. Indeed, when bestowing a weapon, preparations must be made for taking it away.

Onyx Lord's Greatsword
Curved Greatsword • Lvl Required 7
Weapon Skill: Onyx Lord's Repulsion
Thrust the armament into the ground to create a gravity well. In addition to dealing damage, this attack sends enemies flying away.
Greatsword forged from golden-hued meteoric ore. The blade conceals gravity-manipulating magic. A weapon unique to the Onyx Lords, a race of ancients with skin of stone who were said to have risen to life when a meteor struck long ago.

Zamor Curved Sword
Curved Greatsword • Lvl Required 7
Weapon wielded by the knights of Zamor who earned great renown during the War against the Giants. In apparent devotion to winter, the curved blade is styled after an icy wind and imbued with a powerful frost effect.