Arkhan the Cruel

Arkhan is a heavily muscled, red-scaled dragonborn, nearly seven feet tall.
Around his neck he wears a loop of golden thorns inset with dozens of gems, representing each of the chromatic dragon colors. It is an exalted legendary magical artifact called The Wreath of the Prism and grants him control over powerful beasts and monstrosities. His holy symbol is an amulet adorned with the five-headed dragon sigil of Tiamat built into the chest plate of his heavy armor. This same symbol is emblazoned on the front of his magic[citation needed] shield.
He wears a suit of jagged, spiked, obsidian-metal plate armor with green dragon scales embedded throughout the main plates. He carries Fane-Eater, a magical battleaxe carved from deep cerulean sapphire and adorned with numerous runic sigils
Background
Arkhan was a former hired killer who was imprisoned and nearly beaten to death in an attempted forced conversion by a religious cult. Arkhan was able to break his chains and murder his captors, aided by visions and power granted to him by the five headed chromatic dragon goddess, Tiamat. Thus, the Level 3 Paladin chose to become an Oathbreaker and took up worship of the Scaled Tyrant
After receiving a vision from Tiamat, Arkhan set out to find the location of a mysterious cave. He was led to a monk named Duan of the Cobalt Reserve, who revealed its location as the Vault of Shumas. Not knowing what dangers lay within he hired a small band of mercenaries: The Headmistress, Percival de Rolo, Keyleth and Dupont Dupont. Dupont Dupont activated the trap necessary to open the vault. Inside were multiple Yuan-Ti and other snake creatures that Arkhan and his hired mercenaries killed, allowing Arkhan to retrieve Tiamat’s powerful relic inside.
Vander, a high elf Arkhan considered to be "the closest thing he’d ever had to a brother," was burned to death in an attack by Vecna’s Death Knight aided by Delilah Briarwood. This ambush also led to someone cutting out the still beating heart of a Goliath companion of Arkhan’s.
Arkhan then chased Delilah and the Death Knight to Thar Amphala on a white dragon named Obatalá. Obatalá was killed and Arkhan was left for dead by Vecna's followers.
While attempting to wrestle a gloomstalker to the ground, Arkhan stumbled into a building where Vox Machina were hiding. With the aid of Vex and Grog, Arkhan used the Wreath of the Prism to take control of the gloomstalker he dubbed “They,” thus turning it into his attuned mount.
Afterward, he and Vox Machina struck a deal. If Vox Machina could look past the religious differences between their good-natured gods and Arkhan’s Queen of Darkness, Tiamat, and help Arkhan get revenge on the Death Knight, then he would in turn join them and “fight for their lives with the fury of a man who was already dead.” The group unanimously agreed and soon after put Grog and Arkhan into position to destroy an outer sigil protecting Thar Amphala.
This unfortunately attracted the attention of Sylas and Delilah, riding atop a now undead Obatalá. Arkhan and Vox Machina managed to defeat Delilah (which ended the force reanimating Obatalá), but Sylas escaped. Arkhan then took a bit of revenge by animating Delilah's corpse into his own undead puppet.
Inside the tower of Entropis, Arkhan encountered a reanimated Vander and successfully channeled the power of Tiamat to use Control Undead on his former companion. Further up the tower, had it not been for a “lucky” natural 1, Arkhan would have beheaded Shaun Gilmore due to a trick by Vecna.
Vox Machina’s moment of relief was interrupted when Vecna’s Death Knight caught up to the group. A revenge fueled Arkhan chose to stay behind and sacrifice himself by holding the knight back with his two undead minions while Vox Machina continued on to confront Vecna himself.
Arkhan defeated the Death Knight and rejoined Vox Machina late in their battle with Vecna. He made a dramatic entrance by tossing the severed head of Delilah Briarwood and the Death Knight’s helmet into the crevasse below. Having used a magical potion of flying to manifest a faint pair of shimmering, chromatically-shifting dragon wings, he flew up into the fight and added key support by using the last of his Divine Smites to break Vecna’s spell concentration at a key moment in the battle, returning a banished Grog and Scanlan to the Prime Material Plane. Eventually Arkhan and Vox Machina managed to defeat Vecna using the Divine Trammels and the Tome of Isolation. Vecna imploded leaving behind no trace save for his weaponized hand. Then with the support of Vox Machina, Arkhan prepared to destroy the Hand of Vecna for good. He raised his magical battle-axe Fane-Eater above his head and whispered a prayer to his goddess Tiamat but instead of swinging the axe down onto Vecna’s hand, Arkhan chopped off his own hand at the wrist. In the wake of Vox Machina’s shock, he attached the Hand of Vecna to himself, healed himself, and then Teleported out, claiming it was “just business." Arkhan had Teleported to Avernus.
Current Info
Arkhan replaced his left hand with a legendary artifact known as the Hand of Vecna, with the intention of using its power to free Tiamat from her prison in Avernus.
By the Year of Twelve Warnings, 1494 DR,Arkhan, having taken residence in a tower located near a monument dedicated to Tiamat in Avernus, had yet to succeed in his endeavor. Prolonged possession of the Hand of Vecna was slowly causing his left side to become corrupted, a process that could only be slowed down by sacrificing the life of good creatures