Arms of the Betrayers

Before the Calamity, eight of the Betrayer Gods each forged a sentient weapon using the life force of a greater fiend and gave the weapon to a chosen champion in the kingdom of Ghor Dranas. The Calamity flung these weapons across Wildemount, burying them in mountains, forests, fields, and underground. Several of these weapons have been recovered, but a few have never been found and are highly sought-after. The weapons—or more properly, the fiends bound inside them—attract their own followings of mortal worshipers.
When an Arm of the Betrayers is found, it grants its wielder some of the power of the Betrayer Gods and the wisdom of the fiend within. The bound fiends know that their war was lost long ago, but they still desire to be used in battle, win victories, and spill blood in the hands of skilled warriors. As a weapon’s wielder becomes more powerful, so too does the weapon, which in turn is able to lend even more magic to the wielder. Whenever a weapon’s wielder dies, the weapon disappears and reappears elsewhere.
The Betrayer Gods made the following weapons:
Blade of Broken Mirrors. This stone dagger of Tharizdun has yet to be found after the Calamity. It has the power to warp reality around its wielder. The life force of a glabrezu named Ragazuu was used to forge the weapon.
Grovelthrash. This obsidian warhammer carries the tortured will of Torog and can raze whole structures with a single strike. The life force of an ultroloth named Ciria was used to forge the weapon.
Lash of Shadows. This Zehir-touched whip ends in five serpent heads that pump poisons of varying effects into the wielder’s foes. The life force of a marilith named Sizlifeth was used to forge the weapon.
Mace of the Black Crown. This mace with a fiend’s head of ruby carries the boon of Asmodeus, capable of summoning devils for the wielder to command and burning hot enough to melt steel. The life force of an erinyes named Xartaza was used to forge the weapon.
Ruin's Wake. This Gruumsh-blessed ivory spear can effortlessly pierce armor and transforms into lightning when hurled. The life force of a balor named Yarrowish was used to forge the weapon.
Silken Spite. This rapier has a blade forged from spider silk that gives the wielder Lolth's blessing. The life force of a yochlol named Sinnafex was used to forge the weapon.
The Bloody End. This adamantine morningstar bears the boon of Bane, and has yet to be found after the Calamity. It has the power to subjugate the wielder’s enemies. The life force of a pit fiend named Izeelzee was used to forge the weapon.
Will of the Talon. This war pick bears the mark of Tiamat and makes the wielder impervious to the elements and grants them the power of dragon breath. The life force of an bone devil named Ashtyrlon was used to forge the weapon.

Betrayer Artifact Properties

The Arms of the Betrayers advance in power in the same manner as the Vestiges of the Divergence. In its dormant state, each of these artifacts has one minor beneficial property and one minor detrimental property. When the artifact attains an awakened state, it gains an additional minor beneficial property and an additional minor detrimental property. When the item reaches its exalted state, it gains a major beneficial property. See "Artifact Properties" in chapter 7 of the Dungeon Master’s Guide for more information.

Destroying These Artifacts

Destroying any of the Arms of the Betrayers is no easy task. Most conventional means of destruction fail to even scratch one of these ancient artifacts. Each weapon’s method of destruction is determined by the DM and should be unique and require at least one adventure to accomplish. The DM can choose or roll for a weapon’s method of destruction on the Arms of the Betrayers Destruction table, or use the table as inspiration.
When one of the Arms of the Betrayers is destroyed, the soul of the fiend within the weapon returns to its home plane—and begins to plot the destruction of the creatures responsible.

Arms of the Betrayers Destruction

d8	Destruction Method
1	The weapon must be bathed in the ichor of an archdevil or demon lord.
2	A coven of twelve night hags must perform an eight-hour ritual known only to them on the plane of Gehenna to destroy the weapon.
3	The weapon must be brought back to a forgotten forge in Xhorhas and melted down by the furnace that made it.
4	The fiery breath of an ancient red dragon is the only thing that can destroy the weapon.
5	The weapon is destroyed if devoured by Uk'otoa.
6	Thrusting the weapon into a Luxon beacon destroys the weapon and the beacon alike.
7	The weapon can be broken only by a blow from another of the Arms of the Betrayers.
8	Burning the remains of the first champion to wield the weapon destroys the item.

Arms of the Betrayers Distribution

Weapon	Location	Wielder (if any)
Blade of Broken Mirrors	Unknown
Grovelthrash	The Dungeon of Penance (Rosohna)	Aurora Watch warden
Lash of Shadows	Urukayxl	Yuan-ti champion
Mace of the Black Crown	Nine Hells	Zerxus Ilerez, champion of Asmodeus
Ruin's Wake	Bazzoxan
Silken Spite	Tomb of the Silken Servant (Vermaloc Wildwood)
The Bloody End	Buried in the Barbed Fields, guarded by a giant monster
Will of the Talon	The Koshtask tribe of the Iothia Moorland	Arakki, chosen of Gruumsh