Vandran

 was a human captain and mentor of Fjord who had some connection to Uk'otoa, Fjord's patron. As an NPC, he is played by Matthew Mercer.

Background
Vandren learned of Uk'otoa and made a pact with it. He absorbed a Cloven Crystal after killing its previous owner.

Vandren recruited Avantika as an ally to help him release Uk'otoa. He showed her a ritual after which Uk'otoa began to communicate with her through dreams. Avantika's journal describes them traveling together for a few years with Vandren guiding her to signs from Uk'otoa. When Vandren was the only one to have a Cloven Crystal, he and Avantika planned to go to Urukaxl, but they never made it. They discovered another Cloven Crystal was being auctioned off in Port Damali. Avantika and Vandren stalked the collector who bought it to an unknown island, killed him, and took the crystal.

At some point during their travels, Vandren decided to abandon the quest. Avantika wrote of him getting cold feet and beginning to mistrust the dreams. She attempted to gift Vandren as a sacrifice to Uk'otoa. He got away, taking a Cloven Crystal with him. Vandren successfully hid from her for a number of months before she gave up the search.

Vandren captained a merchant ship for a number of years, during which time he grew close to Fjord. If Fjord's vision of Vandren absorbing a Cloven Crystal was accurate, it means Vandren found a way to get the Cloven Crystal out of his body.

Vandren was presumed dead after Sabian sabotaged the Tide's Breath and it exploded.

When Fjord pushed the yellow eyelike orb into his chest, he was transported into a vision where he was Vandren. In the vision, Vandren pushed the same orb into his chest while standing over the body of its previous owner. He summoned the same falchion Fjord wields.

When questioned afterwards, Fjord described the vision and mentioned Vandren as his mentor who he had not seen since sabotage sank the ship they were on. Fjord had never seen Vandren with an orb like this or his falchion, yet Vandren had both in the vision. Fjord realized Vandren in the vision looked younger than Fjord remembers him, implying his vision may have been of the past.

Captain Avantika told Fjord that the one who introduced her to Uk'otoa was Vandren, and that he had wielded a sword that was just like Fjord's. She also said Vandren had an amber stone just like the one she and Fjord carried within them. She referred to the falchion as the "Sword of Fathoms."

Fjord attempted to lie to Avantika, claiming he did not have a connection to Vandren. She was able to see right through his deception, leading Fjord to point her to the location where Vandren's ship sank.

During the trial held by the Plank King, Avantika invoked Vandren's name, which many of the surrounding pirates recognized. She attempted to claim that Fjord had blown up the Tide's Breath to murder Vandren, though Fjord had not told her of the explosion on the ship.

Fjord hoped for a vision of Vandren when he inserted a Cloven Crystal, but only saw Uk'otoa and expressed his disappointment afterwards.

Caduceus asked the Wildmother what Vandren was doing through Divination. The Wildmother responded that he was laying low and trying to make amends.

Avantika
Avantika wrote in her journal of Vandren guiding her towards being closer to Uk'otoa, giving her the ritual that started her dreams of a great eye. It is unclear if their relationship was romantic or platonic. Avantika considered him leaving the quest cowardly and a betrayal.

Fjord
Fjord has described Vandren at various times as a "mentor" and "father figure". Fjord thought he had known Vandren very well during the years working for him. The revelations that Avantika and other pirates on Darktow Isle knew Vandren seemed to take him by surprise. Seeing that someone looted Vandren's quarters after the Tide's Breath wrecked seemed to make Fjord angry. It is unclear how Fjord feels about Vandren now.

Sabian
Vandren hired Sabian along with Fjord as crew of the Tide's Breath. It is unknown if Sabian intended to hurt or kill Vandren specifically by sabotaging the ship or if he had other reasons.

Uk'otoa
It is unknown how Vandren first came into contact with Uk'otoa. At one point, he was very committed to releasing it. He changed his mind for unknown reasons, but still kept a Cloven Crystal and the Sword of Fathoms.

Wyatt Marinos
Avantika accused Fjord of using the memory of Vandren against her during her trial, implying Wyatt should recognize his name. Several of the crowd watching the trial recognized Vandren's name as well, implying he is a former member of The Revelry.

Warlock Abilities

 * Pact Boon (Pact of the Blade)
 * Whether Vandren still has warlock abilities is unknown, since the vision of him summoning a pact weapon seemed to take place in the past and Fjord now wields the Sword of Fathoms.

Notable Items

 * Cloven Crystal (acquired from the body of an unknown man, kept in captain's quarters of the Tide's Breath, taken by Dashilla from the Tide's Breath wreck)
 * Sword of Fathoms (lost when the Tide's Breath sank, recovered by Fjord)

Trivia

 * Vandren's ability to summon a pact weapon confirms he had at least three warlock levels at the time he acquired a Cloven Crystal.