Voruun Hale, the Unburied King

"You brought all four. They kept their promises longer than I kept mine."

Voruun Hale, the Unburied King, is the capstone of the whole game. At the end of Act IX he rose out of the Zao rift, said "Come to my island when you are ready to see what I have made of it," and left. Your reply is the Sigil.

Requirements

A Sigil of the Unburied King: four Seals, one from each pinnacle (Seals and the Sigil of the Unburied King).
Area level 86, higher than anything else. A party of up to six can enter through the map device (The map device).
Every participant who wants loot must have earned all four Seals once.

The fight. He fights at full power, the end of the shard story. Details are held back so that you meet them yourself. Expect him to speak in the same voice as in the cutscene, and to be a team boss.

Rewards

Per player loot, rolled in private reward chests. Several items for each eligible player, drawn from his own table.
Tier 12 bases, the highest tier in the game. They drop only from him (Bases and tiers).
Chase uniques: Voruun's Mortal Shell, The Unburied Sigil, Citadel Gatekeeper's Razor, Hat of the Unburied, The Unburied Grimoire and Seal-Bearer's Ward. The Grimoire can give a fifth glyph slot (Unique items, Glyphs). They have a pity timer that guarantees one within a few kills.
One passive point the first time (Passive points and respec).

Seasons. First kill of the season is a Realm First entry in the hall of fame, with a unique title, and Voruun Hale is one of the season challenges (Season rewards and the ladder).

Story. He was once a scribe who wanted only to keep the dead from the dark. The shards remember him better than he remembers himself (The Nine Shards).

Preparation. Elemental resistances near the cap, a full belt, a build that survives long phases, and a party that has done pinnacles before.

Status: the fight is not yet built (coming soon). The rules around it are in place.