A fervent disciple of Asha, Arantir claims he is several centuries old, though was not memorably active until the later events of Queen Isabel's War. A scholar of demonic lore, he emerged following the death of Necrolord Markal, and proceeded to conquer over half of the territories of Heresh, challenging and destroying four of his fellow Necromancers. Quickly asserting himself as a fiercely competent tactician as well as an accomplished spellcaster, he soon caught the attention of Lord Giovanni, an ambitious rival Necrolord with dreams of grandeur.
Posing as a loyal vassal, Giovanni had his apprentice Ornella slay Lord Malfroy and take the northwestern city of Iluma-nadin as a gift to Arantir. When Arantir arrived to claim it, Giovanni presented him Ornella as well, requesting that he transform her into a vampire through the Kiss of the Spider Goddess. Agreeing, Arantir teleported the three to Asha's Web and performed the ritual. As he completed the process, Giovanni, seizing his chance, rushed toward Arantir and attacked him from behind. However, Arantir retorted with a spell, killing Giovanni as Ornella watched. She was quick to swear fealty to Arantir, and he had her sent to Nar-Ankar to "purge her spirit further in the crucible of the Goddess".
Learning of Demon cultists in the Silver Cities, Arantir journeyed with Ornella to the northwest. There, capturing the wizard cultists' headquarters, he interrogated one of their members, who told him of Orlando - the hierophant of the cult of Urgash - and sought the wisdom of a Blind Brother, who spoke of the prophecies of the Demon Messiah and events yet to occur. Paying this knowledge little heed, Arantir pressed on to the lands of the Bull Duchy, where Giovanni had already prepared his own assault on Orlando's forces. He met Kujin and she recognized him as one of his omens. They made an alliance and proceeded with their tasks. Arantir assaulted the Holy Griffin Empire and killed Orlando, but had to sacrifice Ornella. Still, Asha sent him on the task and he freed Isabel's soul in Flammschrein, then went to search for the Skull of Shadows.