Calcelmo's Stone is an artifact bearing inscriptions in both the Dwemer and Falmer alphabets. The Falmer inscription may be translated almost fully using our knowledge of the Ayleid language, and the result is relatively close to the official translation given by Kurt Kuhlmann.
Chillrend is an artifact of unknown origins. It takes the form of a glass shortsword, although, unlike regular malachite, it is blue instead of green. Like other glass weapons, its hilt was fashioned from rare metals and moonstone. Its enchantment varies in strength and properties, but it always causes magical frost damage to the opponent. Other known effects include causing a weakness to frost, or temporary paralysis. It also repairs itself when the wielder takes frost damage.
The sword's first known owner was Valus Odiil, an Imperial adventurer who wandered Tamriel (or at least Hammerfell). Valus eventually settled down in Cyrodiil, and bought a farm outside the walls of Chorrol. However, his farm was continuously raided by goblins from the Great Forest, and the town guard refused to help. In 3E 433, unable to fight in his old age, he asked the Champion of Cyrodiil to aid his two sons in killing the goblins. After the battle, Valus passed on Chillrend to the Champion for keeping his sons safe, saying that he was going to spend the rest of his days in peace.
Sometime after the end of the Great War, around 4E 180, the former member of the Blades, the Warrior, came across Chillrend in their journey. The method of acquisition of the sword is conflicted, however. Some claim that it was obtained from the plane of Oblivion known as the Abyss, while others believe it was looted from a chest obtained from a conflicted location.
The sword later came into the possession of Mercer Frey, the Guildmaster of the Skyrim branch of the Thieves Guild. Mercer was a renowned thief who secretly possessed the Skeleton Key, which gifted him with great luck. By 4E 201, Mercer had stowed the sword in the secret basement of his Riften home. The sword was taken by the Last Dragonborn after it was discovered that Mercer had betrayed the Guild.
Chrysamere, also known as the Paladin's Blade and Sword of Heroes, is an ancient adamantium claymore artifact with offensive capabilities only surpassed by its defenses. It has magical properties which, unlike most weapons, are defensive in nature; it lends the wielder health, boosts their resistance to fire, and reflects some damage from spells.
For more information, see the main Lore article.
Cleaver of St. Felms
The Cleaver of St. Felms the Bold (or St. Felms' Cleaver) is a one-handed axe which belonged to the eponymous saint of the Dunmer. In or before 3E 427, a Buoyant Armiger carried it into battle against ash vampires on the northeastern slopes of Red Mountain and died. The Nerevarine recovered the holy relic and then received it as a reward for various services to the Tribunal Temple.
Crosier of St. Llothis
The Crosier of St. Llothis is a staff sacred to the Dunmer as a holy relic. The undefeated spirit of St. Llothis the Pious is said to be contained within it. However, the staff's fitness for combat is questionable, as the staff's enchantments actually have various adverse effects on the wielder.
Circa 3E 427, the Captain of the Buoyant Armigers took the staff into battle against Dagoth Ur's forces on Red Mountain. To protect his retreating subordinates, the Captain mounted a last stand near Dagoth Ur's citadel, and the staff was lost. The Nerevarine soon recovered the relic, and then received it as a reward for various services to the Tribunal Temple.
Crown of Barenziah
The Crown of Barenziah is the coronation crown of the eponymous Queen of Morrowind, Barenziah. It is a golden crown with a winged-motif that has twenty-four ornate jewels, known as the Stone of Barenziah across the wings and one on the temple of the head. It was given to the young queen during her ascension to the throne of Mournhold in the early years of the Third Era, amidst the reign of Emperor Tiber Septim. However, sometime after the ceremony, the crown was stolen by an unknown assailant. He pried each of the stones off of the crown and dispersed them across Skyrim, where they became items of interest. For two eras, the Thieves Guild of Skyrim had sought out all twenty-four stones for many years, while the crown was kept in Morrowind.
Crown of Freydis
The Crown of Freydis, originally the Crown of Verity, was a magical artifact created to test the worthiness of potential rulers of Skyrim. It is the second royal crown of Skyrim, replacing the Jagged Crown when it was lost to time during the War of Succession. However, in time it faded from use, and it has not been seen since the Second Era.
Crown of Nenalata
The Ayleid Crown of Nenalata is an ancient Ayleid artifact. Its appearance varies, sometimes appearing as a lightweight Moonstone helm, sometimes as a simple crown. It can be distinguished from other Ayleid crowns by a royal glyph emblazoned upon it. Superficial enchantments grant the wearer spell reflection and increased skill at Alteration and Conjuration magic, although the true potential of the crown is seemingly much greater. It is an immensely valuable treasure.
- Oblivion, ESO
The Crusader's Relics are a set of Aedric artifacts, created by the Eight Divines and given to Pelinal Whitestrake, the Divine Crusader. The set includes a suit of armor, a shield, a mace and a longsword, which mold to the needs of the wielder and increase their proficiency in the School of Restoration. The artifacts were used by Whitestrake to banish Umaril the Unfeathered, an Ayleid Sorcerer King. In the battle, Umaril had dealt him a fatal blow, and with his death the relics were scattered and lost.
In 3E 111, Sir Amiel Lannus founded the Knights of the Nine with the intent of recovering the lost relics. The order grew in fame, and recovered many of the holy relics, but after the War of the Red Diamond the knights slowly disbanded, losing all but one of the relics.
In 3E 433, Umaril the Unfeathered returned to the mortal realm, having been reborn in the Fires of Creation due to his alliance with Meridia. The Fallen King led an attack on the Nine Divines by desecrating chapels with his army of Aurorans. Following the calling of a mysterious prophet, a pilgrim set out to retrieve the relics and reform the Knights of the Nine. The pilgrim succeeded, becoming the Divine Crusader reborn and destroying Umaril, body and soul. The relics are now held in the Priory of the Nine.