The Queen's Domain endings are four achievements among the game's 53, and all four are decided by the same final fight against Queen Siraatsu. What changes is the sword you bring and, for the last two, a choice you make after the fight. You do not need a new game: nothing in the game ends your save file, so after the credits you carry on exploring and go back for the next ending on the same save. Beating Siraatsu the first time is itself a step toward the others.

Ending 1: Most Unfortunate

Reach Siraatsu Castle, which pops the Halls of Hatred achievement, fight through it and beat Queen Siraatsu with whatever you like. If neither Akunra nor Okbujo's Judgement carried the fight, this is the ending you get.

The castle's central gate stays shut until you beat the three bosses inside, so clear Castle Lords Obetda and Ubhaer, Dekanima Ritual of Blood and the High Spec Automatons first. About 6 percent of players have this ending.

Ending 2 needs the True Holy Sword Akunra

This ending, A Kingdom Free From Darkness, is tied to the True Holy Sword Akunra, the reforged version of the Holy Sword Endu. It takes four steps:

  1. Fully upgrade Endu. The altar refuses the reforge if Endu is not at full strength, and says the bond is not strong enough.
  2. Clear all eight Sipeha seals, which need the Mask of Second Sight and its lenses, and at least three of the gods' lenses to reach the place where the sword evolves.
  3. Reforge at the Temple of Puwema, which the eight seals open at the top of Verdant Hollow. Walk through it to the purification altar and Endu becomes Akunra, popping Blade Bathed in Holy Light.
  4. Use Akunra on Siraatsu.

Players disagree on how much Akunra has to contribute, so the safe play is to use it for the whole fight and finish her with it. About 3 percent of players have this ending, and Akunra also opens a back way into the memento altar used for Ending 3.

The Holy Sword Endu guide has the full reforge.

Ending 3 needs the Memento Mirror

This ending, God Slayer, is the first of the two that end in a choice. It takes four steps:

  1. Get the Memento Mirror by beating the Herald of Okbujo in the Record of Sin and talking to it afterwards.
  2. Finish the eight character quests so each ghost hands over its memento. Chef Gagi after 60 meal tickets found under food platters, Captain Aganmi after learning his crew's fate and bringing back their necklaces, Erma Matron of the Deep after every Orbewa egg, Mechanical Engineer Ossi after all of his modules, Knowledge Keeper Wourha after a complete bestiary, plus the King your father, Commander Ekonta the knight from the start, and Peha who gave you the Puwema lens, found at her coffin.
  3. Forge Okbujo's Judgement at the hidden altar in Deimpo Mausoleum. It sits behind a hidden door on the lower level of the big red water room that holds a Wind Gem, in a room with four symbols on the wall where the door needs all four lenses in the Mask of Second Sight. Most players reach it with Akunra, others with the Cestus uppercut as an extra jump or with flight.
  4. Beat Siraatsu with Okbujo's Judgement for the whole fight and choose Banish at the end.

Again the threshold is disputed, from half the damage to every single hit, so do not switch weapons mid-fight. About 3.2 percent of players have this ending.

The Memento Mirror guide has the eight ghosts.

Ending 4 needs the skull door

Eat is the rarest ending, under 1 percent of players, and the only one whose achievement text gives nothing away.

  1. Open the way to the skull door under the Petrified Garden, which needs all five Trident keys and all four lenses. Wake the garden at the central fountain, hit the glowing fish statues three or four times each, activate the symbols, then drop down into one of the houses.
  2. Hand in every one of the 69 Strange Silver Etched Skulls. The door takes them in batches and pays out along the way, with a duck figurine at around 10 and a fossil accessory that lets you float upward at around 30. There is no in-game counter, so keep your own tally.
  3. Trigger the ritual. After the last skull, the door's dialogue talks about preparing for a ritual, and the door does not always open straight away, so rest and reload the area if it stays shut.
  4. Repeat Ending 3 and choose Eat instead of Banish.

If the door stays shut with what you think is all 69 skulls, you are most likely one or two short.

The Petrified Garden puzzle guide has the garden itself.

The Queen's Domain endings and the order to do them in

Do Ending 1, then 2, then 3, then 4. Beating Siraatsu is needed to unlock the others, Akunra gives Ending 2 plus a second way into the memento altar, and the character quests and the skull hunt can be run at the same time because both send you to every corner of the map and both the skull door and the memento altar need all four lenses.

Do Ending 3 before the ritual if you want to be safe: pick Banish, take God Slayer, then finish the skulls and come back for Eat.

On time, a focused run to Ending 1 lands around 20 hours at the fast end. Ending 2 adds the eight Sipeha seals and a maxed Endu, and Endings 3 and 4 are close to full completion at roughly 60 to 80 hours.

The boss order guide lists the fights in sequence.