Vanstrom Klause, formerly Ascertes Hallow, is a vampyre noble, one of the brutal henchmen of Lord Drakan, and the leader of the Vyrewatch. Vanstrom is a murderous fiend who strikes terror into the hearts of the Myreque, a resilient group of guerrilla fighters from Morytania dedicated to fighting their vampyric overlords. Vanstrom is Safalaan Hallow's father, the former King Ascertes Hallow, who was transformed into a vampyre by Lowerniel Drakan after his capture during the Siege of Hallowvale.
In life, King Ascertes Hallow was the human husband and consort of Queen Efaritay, the Icyene queen of Hallowland, and father of their children, Safalaan and Larina Hallow. Very little is known about Ascertes, but he was presumably born in the Third Age and married the queen some time before the Zamorakian invasion led by Lord Drakan. During the Siege of Hallowvale, Ascertes was captured by Ranis Drakan and Verzik Vitur, who brought him to Lord Drakan. In Sins of the Father, it is revealed that Ascertes was turned into a vampyre during the Hallowvale invasion, in an attempt to end the ongoing war and force the queen to surrender to the Zamorakian invaders.
Upon being transformed into a powerful vampyre, the first thing that Vanstrom did was murder his daughter, Larina, and attempt to murder his son, Safalaan, who was able to repel Vanstrom with his innate Icyene abilities and escape; this caused Safalaan to lose his memory. Vanstrom then swore fealty to Lord Drakan, and was given the position of tithe master in all of Morytania, overseeing the blood tithes throughout the region. He was also tasked with destroying any rebel cells that sprung up to oppose Drakan's rule.
Ages later, Vanstrom learned of an ambitious rebel organisation, the Myreque. Though he knew the identities of members of the organisation, he did not kill them off one by one, as it would have alerted the rest to his intentions. Much to his dismay, however, he was unable to find their hideout, where he could put an end to the rebels once and for all. Eventually, Vanstrom discovered a human who had crossed the River Salve and ventured into Morytania. In his disguised human form, he told the adventurer of the Myreque and convinced the adventurer to help bring him some steel weaponry for the Myreque, under the guise of coming to their aid. Vanstrom followed the adventurer and discovered the hideout, upon which he immediately barged in, easily dispatching Sani Piliu and Harold Evans. He then summoned a skeletal hellhound to kill the remaining members. To his disappointment, the rebels were able to escape after the adventurer slayed the hellhound.
Some time later, Vanstrom, speaking to Gadderanks, a human blood collector, expressed disappointment with Gadderank's inability to fulfill his quota. Gadderanks defended himself by stating that there wasn't enough to tithe, as Malak got sick after consuming blood from Mort'ton, and while Canifis was giving more blood than agreed, it was not enough. Vanstrom then smelled some smoke which came from the town of Burgh de Rott; the adventurer had repaired the furnace, which alerted him to the revived town's position. Vanstrom then sent Gadderanks and two juvinates to begin blood tithes there, but they were killed by the same adventurer. It is also implied that Vanstrom sent some juvinates to intercept Ivan Strom's journey to Paterdomus temple, but this, too, failed.
As the adventurer was taking sketches of Castle Drakan, Vanstrom spotted and attacked them by surprise. He easily overpowered the unprepared adventurer, but was forced to let them go after Sarius Guile, Vanescula's servant, stoically informs him that Vanescula wanted them alive. Vanstrom begrudgingly complied and left the scene.
Knowing the continued existence of the Myreque was a nettlesome threat to the vampyres, Vanstrom conspired with Ranis Drakan to rout them. Unbeknowst to them, the adventurer watched as the two paid a visit to Verzik Vitur at her castle. Verzik gave the two her abomination, claiming that once it obtained a whiff of a target's blood, it could track them anywhere. Vanstrom then headed to Serafina's former home and created an elegant trap that was able to trick Safalaan into giving up his blood, allowing the abomination to discover the location of the hideout. As with Ranis, he confidently believed that the Myreque were finally exterminated, but soon learned that Ranis had been slain by the adventurer.
Following Ranis' death, Vanstrom was still unable to locate the Myreque. However, he had more pressing matters at hand, having learned of an illegal blood tithing operation at Slepe. He confronted Damien Leucurte in the Crombwick mansion basement, where he met Kroy. Vanstrom immediately disliked Kroy, considering him to be "barely" a proper juvenile, but soon learned from the juvenile that he had replicated the Elixir of Everlasting. Damien explained that they mixed the elixir into the town's Bloody bracers, putting the humans into a deep sleep which allowed them to take more blood than was otherwise possible, as the Elixir kept them alive in their torpid state.
Vanstrom asked Damien who had given him permission to do this. Damien explained that the nobles of Darkmeyer had requested it, but Vanstrom overruled him and stated that he would be the one to decide. Although impressed by the ingenuity of their idea, he warned Damien that he had attracted the attention of the Myreque, including the human that had killed Ranis; due to this precarious position, House Drakan could not protect him. Damien asked for protection, but Vanstrom refused, as he had defied Lowerniel in this secret undertaking.
Soon after, the adventurer infiltrated Darkmeyer and attempted to enter the Arboretum, but was denied entry by Desmodus Lasiurus. Fortunately, they were able to bargain with Desmodus, who had the rightful custody of Gadderank's widowed wife and son following his death, as Vanstrom owed Desmodus a favour. However, the juvinate that was supposed to relieve them to him, Mordan Nikazsi, had been intercepted by Lord Alexei Jovkai, who had plied the juvinate and immediately purchased them. The adventurer snuck into the prison the Gadderanks family was being held in, but was caught by Alexei, who asked what they were doing. Vanstrom, who had been on his way to the lower levels of the city, heard Alexei's shouting and investigated. Upon being informed of the situation, he recognized the Gadderanks family, and ordered Alexei to relinquish them, as they belonged to Desmodus. Vanstrom then recognized the adventurer's voice and demanded to see their face, which would have broken their cover, but Sarius arrived and stated that Vanescula needed him, much to his annoyance, and he dropped his inquiry, allowing the adventurer to slip away safely.
After the adventurer acquired blisterwood sickles for the Myreque, Vanescula brought the party to Castle Drakan to put their coup into action. She was immediately met by Vanstrom, who asked her what she was doing. He was astonished to learn that she had somehow obtained all of the Myreque when he had not, unaware of her plot to overthrow Lowerniel. However, Lowerniel anticipated her treason and confronted them, killing off Vanescula's vyres and incinerating half of the remaining Myreque. Lowerniel then tasked Vanstrom with killing off the survivors as he apprehended Vanescula. Although Vanstrom had considerable vampyric powers at his disposal, the adventurer was able to defeat him. Safalaan then intervened and attempted to appeal to his father's past self, Ascertes Hallow, but Vanstrom claimed that he had been uplifted in becoming a vampyre and taunted Safalaan, revealing that he had enjoyed killing his sister. Taken aback, Safalaan involuntarily emitted a blast of energy, killing Vanstrom.
- ^ While the effects of a black mask or Slayer helmet do work on Vanstrom during Sins of the Father, killing him does not count towards completion of the slayer task, and hence does not award any experience.
- ^ Jagex. Mod Ash's Twitter account. 28 February 2021. (Archived from the original on 10 June 2021.) Mod Ash: "I think that's true for him, Damian and Kroy, as well as juvinates." In response to the question: "Is it true that Vanstrom Klause and others from SotF can be killed as part of a Vampyre task?"