Ilinathach (Major Spoiler)

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Ilinathach is the name of both the giant underground empire carved out under Atakumi, as well as its ruler, Ilinathach Til.

Ilinathach Til
Ilinathach Til is the twin brother of Iluvia Til, queen of Marenmir. In the aftermath of the Planar War, denizens of other planes came through to the Prime Material and settled upon Atakumi, beginning what is now referred to as the Modern Age. Ilinathach was the leader of a group of High Elves from the Feywild, some of whom, including Ilinathach himself, had fought to defend their home from nefarious creatures who had taken advantage of the planar rifts created by the war. The surviving warriors and their kin believed themselves changed, perhaps even tainted, by these interactions, and at Ilinathach's suggestion decided to settle the small island to the Northwest of the continent of Atakumi.

Ilinathach and Iluvia, along with Iluvia's partner Sirion Sadir, shaped a monarchy and directed the construction of the huge edifice which would become known as Marenmir to center their new society around. However, rather than working together with Iluvia and Sirion, Ilinathach quickly became power-hungry and worked to implement his ideas for what their new home should look like, despite objections from a majority of the elves who had settled there. A small faction, many of whom had fought under Ilinathach during the Planar War, rallied around him and helped to establish a brief period of military rule.

One of Ilinathach's "captains" was an elderly wizard by the name of Taom Reha. Prior to the Planar War he was a notorious hermit, although he and Ilinathach had had a close personal relationship for centuries. Taom had gained recognition and acceptance during the war most notably by turning an entire army of undead warriors from the hells and destroying them in one fell swoop. He was given a dedicated space to reside in within Marenmir and continued to keep to himself once he had been established into it. Ilinathach especially made a point to accommodate any research needs he might have, including having a dedicated set of mercenaries to run any tasks Taom could not do himself. In secret, Taom was working for Ilinathach to refine a means to imbue the leader with near-divine power and potentially immortality. During the period of strife caused by Ilinathach's implementation of military rule, Taom hit a breakthrough: he successfully created a Potion of Lichdom.

Ilinathach's period of tyranny was short-lived, as Iluvia and Sirion challenged him on behalf of their oppressed community. Along with a small party of warriors, they forcefully drove out Ilinathach's "captains" and confronted Ilinathach himself. Ilinathach retreated to Taom's study, and in the battle that proceeded, Taom was accidentally killed and both Ilinathach and Iluvia badly wounded. In a last-ditch effort, Ilinathach slashed at Iluvia and stole some of her blood, grabbed what he needed for the lich ceremony, and teleported to an unknown location.

Finding himself underground, Ilinathach struggled through the rites and underwent his transformation alone. Believing himself ultimately betrayed by his sister Iluvia, he made her his phylactery.

Once recovered, Ilinathach called his captains back to him and retreated with them to the underground space he had inadvertently found. Initially, Ilinathach began to make plans for further revenge against his sister. However, he and his captains discovered that there were various races already residing underground, entirely unaware of the world above them. Not one to refuse an opportunity, Ilinathach enslaved the peoples he came across and began to build an underground empire for himself.

Over the course of a few hundred years, Ilinathach's goals shifted, and he found himself ultimately content to remain the ruler of his underground empire, shaping it in all the ways he had never been able to do above ground. Iluvia, however, was left far worse off. The magic worked on her corrupted her body and mind, slowly turning her into a wraith of her former self, which Ilinathach deemed enough revenge for the time being.