Curved Swords in Elden Ring: Nightreign are fast and agile weapons that bolster devastating damage. Their unique moveset allows fluid attacks and status buildup, such as Bleed, especially when powerstanced, which makes them ideal for builds that focus on Blood Loss infliction. While they deal less poise damage than heavier weapons, their damage and fast attacks make them deadly in nearly every scenario.
NightreignCurved Swords - Nightreign Wiki

Bandit's Curved Sword
Curved Sword • Lvl Required 1
Curved sword with a light, crescent-shaped blade. Used by the bandits who ran rampant in the wake of the Shattering. Most of the blade is now darkened and covered in rust, but with enough dexterity this weapon may still stand up to some use.

Beastman's Curved Sword
Curved Sword • Lvl Required 3
Curved sword forged of dull iron wielded by the beastmen of Farum Azula. The blade is heavy but well-balanced. Comparatively easy to wield for the damage it delivers.

Eclipse Shotel
Curved Sword • Lvl Required 10
Weapon Skill: Death Flare
Set the lusterless sun ablaze with the Prince of Death's flames, inflicting the death ailment upon foes. Follow up with an additional input to bring down the armament, triggering an explosion.
Unique Weapon Passive: Power of Despair
Storied sword and treasure of Castle Sol that depicts an eclipsed sun drained of color. One of the legendary armaments. In Sol, the sight of an eclipse inspires a dreadful awe, preventing an onlooker from averting his gaze.

Falchion
Curved Sword • Lvl Required 1
A curved sword with a single-sided blade. Delivers slashing attacks with its sharp blade, but is ineffective against thick armor and hides covered in tough scales. Wielders of the weapon employ a unique style that enhances attacks with spinning motions.

Flowing Curved Sword
Curved Sword • Lvl Required 7
Legends speak of a master of the sword garbed in blue, and his curved blade that was patterned after flowing water. Strong attack unleashes a series of strikes akin to a dance, offering a glimpse into the legend.

Grossmesser
Curved Sword • Lvl Required 3
Curved sword boasting a large blade. This weapon is designed to make use of its weight in combination with its sharp cutting edge. A thoroughly reliable choice of weapon for those who can master its particulars.

Magma Blade
Curved Sword • Lvl Required 7
Weapon Skill: Magma Shower
Slash at foes in a twirling motion while scattering magma all around. Additional input allows for a follow-up attack.
Curved sword with a blade fashioned from the lava of Mt. Gelmir. An armament of the man-serpents, impossible for a human to have made. Deals fire damage.

Mantis Blade
Curved Sword • Lvl Required 3
A curved sword with a blade at both ends wielded by the Cemetery Shades, the insect-ridden grave keepers. The blade is thin and sharp, and strong attack unleashes a far-reaching slash.

Mantis Blade
Curved Sword • Lvl Required 3
A curved sword with a blade at both ends wielded by the Cemetery Shades, the insect-ridden grave keepers. The blade is thin and sharp, and strong attack unleashes a far-reaching slash.

Nox Flowing Sword
Curved Sword • Lvl Required 7
A grim weapon wielded by swordsmen of the Eternal City, this shotel has a blade as fine as a needle. Forged from the liquid metal of a Silver Tear, it is thoroughly tempered until hardened.

Scavenger's Curved Sword
Curved Sword • Lvl Required 3
Unique curved sword, notched like shark's teeth. Weapon carried by corpse pillagers who prowl the sites of old battles. The blade is tacky with blood and covered in hefty nicks, making it totally uneven. Life can be sinister indeed.

Scimitar
Curved Sword • Lvl Required 1
A curved sword with a single-sided blade. Delivers slashing attacks with its sharp blade, but is ineffective against thick armor and hides covered in tough scales. Smaller in size than most curved swords, it carves into enemies with quick, sharp cuts.