The Lich King

The Lich king, sometime also called "The king who does not sleep even in death", is a King of old residing in the graveyard under mount Grief. The king once was the leader of a great kingdom, that kingdom is now completely gone and mostly forgotten save for the Castle atop Mount Grief and the tomb under it. While his kingdom is long gone, the King managed to survive using the power of a relic.

While he still moves and acts to protect what's left of his castle, unlike Undeads or resurrected people, the Lich King can hardly be call "alive". However, he also isn't as mindless as the Zombies raised by the Curse of the No-Life King, which is probably why he is instead called "the king who doesn't sleep even in death".

Appearance
As could be expected from the name, the Lich King is an old humanoid male, possibly human, visibly dead and desiccated but not rotting. Having died a long ago, his dried skin cling to his bones and his eyes are now but black pits. However, despite the corpse-like state of the rest of his body, the King does still have fairly long white/gray hair, strong enough for Haruhiro to grab onto in an effort to cling to the Lich.

Having been a great king in life, he wears lavish clothes covering his whole body leaving only his hands and faces exposed, and his head his adorned with a massive crown. Moreover, a massive golden gauntlet cover his right hand while he holds an impressive scepter in his left.

Personality
As he appears in the series (long dead), the Lich King doesn't seem to have much of a personality and act more like a defense system for the Graveyard. It's unknown if that's a side effect of the relic keeping him alive, if he slowly lost his personality after being alone (and dead) for so long, or if it's because of something else entirely, but we do have some idea of what his personality was like while alive.

The King of old, was, according to some legends, a once powerful and fearless ruler at the head a great kingdom. While he was probably quite arrogant as he chose to build his castle and tomb on the ruin of a temple to the old gods of Grimgar, he also seems to have been loved as the mountain that his now Mount Grief got his name because of the lamenting song his people sung in his honor after his death.

Long before the main series
The still mortal Lich King, then ruler of a powerful kingdom, fearlessly built a castle on the mountain now called Mount Grief, atop the ruins of a temple to the old gods of Grimgar. When he died the king was greatly mourned, his subject singing songs of lamentation, giving the mountain its current name. At least that what some legends say, in fact the king didn't truly died, as through some unknown means, he managed to obtain a relic able to keep him "alive" forever. Since then, and until the event of Level. 17, he seems to have stayed in the throne room of his graveyard under Mount Grief warding of invader with the power of his relic.

Some of this invader being the member of Orion, the clan having tried and failed to conquer the graveyard multiple time, losing some of their member in the process.

Level. 17
The Lich King is the main antagonist of Level. 17. While he doesn't appear in person for most of the volume, he is the one behind the traps and monsters trying to repel the volunteer soldier expedition. He is eventually destroyed by Shinohara after a long fight with part of Orion, Team Renji, the Tokkis, and Team Haruhiro, where he managed to kill 2 of Orion's members. The relic which kept him alive is then taken by Shinohara, unbeknownst to the rest of the expedition.

Abilities
It's unknown how the Lich King fought in life, but from what little information we have, it does seem like he was already quite powerful.

In death, he fights as a powerful mage, most, if not all, of his power comes from the relic ring keeping him "alive". Most of the time, the Lich king uses that power to create sand and rock constructs (golems and traps) to protect the whole graveyard, however, if intruders enter his throne room, he instead uses that power to fight by himself.

In that case, he has been shown to be able to use 4 powerful abilities to fight :


 * 1) Creating Wraiths, more complex sand golems which take on the appearance and skills of people who have entered the tomb, the people they copy can still be alive or have died. Those fake seems to always be as physically strong as the original, but depending on how much care was put into their creation, they have more or less of the skills and fighting style of the original. However, no matter how well they're made, wraith don't have the gods' blessing and can't therefore use divine magic, it also seems like they can't reproduce Relics.
 * 2) Anti-magic, the Lich king is able to create a transparent bluish dome around himself, which protect him from (presumably) all magic by nullifying it. Unlike the other 3 abilities which, so far, seem to be unique to the King, anti-magic can be use by other, although we currently know of only one other way to generate it: blood magic.
 * 3) Sand magic, when forced to fight at closer range, the Lich king can manipulate the sand and stone around him to attack his opponent and keep himself out of reach. When using that power in the fight against the volunteer soldier, he used it to create a sand dragon on which he could stand to avoid a melee fight.
 * 4) Instant death magic, the Lich King's most dangerous attack. That spell creates a shining golden globe which then spew 3 high speed golden bullets. While the spell does cause physical damages, it also seems to have the property of instantaneously killing anyone it hit, as it immediately killed even a giant like Matsuyagi despite only piercing his flank. However, there's at least one possible way to defend against that spell by using Shinohara's relic shield: Guardian. Moreover, it seems like the Lich King isn't able to use that power in quick succession.

However, the King can only use one of them at a time but doesn't seem to have any restriction to switching between them.

Equipment:
The Lich King most important piece of equipment is his ring as it the source of most of his power and the what's keeping him "alive". Something he is likely aware of, as while most of his body is completely unarmored and only covered in expensive robes, his right hand, on which he wears the ring, his covered by a massive golden gauntlet.

Aside from that, the King uses a specter and crown which could also be relics, however, if they are, their effect is currently unknown.