Queen's Domain: All Fossils & What to Do With Them

How the Fossil Set Works

Fossils belong to the game's 33-accessory set (the full set is tracked by the Eclectic Accoutrements achievement), and every one of them comes from a single source: the strange door under the Petrified Garden, which trades rewards for Strange Silver Etched Skulls. The door accepts skulls in any batch size and pays out as your total climbs — the player-reported tiers are:

Two things make this table worth internalizing:

• There is no in-game counter. The door never tells you how many skulls you have handed in, so keep your own tally.
• Check your accessories after every batch. One player received the Fossilized Fish at 20 skulls; if you hand in large batches at once, an intermediate reward can be easy to overlook.

For the full 69-skull location hunt, see the silver skulls guide, and for how all of this tracks toward 100%, the collectibles overview.

Reaching the Skull Door (Prerequisite)

The door under the Petrified Garden is not reachable with skulls alone. The documented route needs:

1. All five trident keys (Sapphire, Emerald, Ruby, Amethyst, Onyx) — the gem statues around the island tell you which colour goes in which slot on the garden's central fountain.
2. All four lenses in the Mask of Second Sight, because the same lenses open the skull door itself.
3. Waking the garden: place the keys, then hit each glowing fish statue three or four times to bring the garden to life (the Living Stone achievement). Some weapons do not register on the statues, so switch weapons if nothing happens.
4. Drop down into one of the houses to reach the door below.

The trident keys and lenses each have their own hunts — the puzzles guide covers both, including where the Ruby key hides on the Trident weapon and the Amethyst key in Umbada's shop.

What Each Fossil Does

The Flying Mushroom Fossil is the one to rush. Guides recommend reaching it early because the late skull routes assume it: some silver skulls sit on ledges that cannot be climbed with dashes alone, and collecting more skulls to trade for the fossil is literally the way to reach the skulls that need the fossil. Getting it at 30 breaks that loop. One practical note from players: after the final 69th skull, if the door does not open and mention the ritual, leave, rest, save, and return — like NPC quests, the door's state refreshes on a world reset.

The Bone Machine: the Fossil-Gated Bestiary Entry

The fossils also matter outside the skull economy. Bestiary entry #77, the Bone Machine, cannot be reached without the Flying Mushroom Fossil. Its spot: in the green garden mid-way through the graveyard (the same garden where Peha's coffin sits), stand at the central goddess statue, look straight up, and float up to the broken glass window — the Bone Machine is inside.

Since Wourha's memento needs a near-complete bestiary, this entry quietly links the fossil set to the mementos chain and, through it, Ending 3. The bestiary hub lists every entry and where it spawns.

Fossils and Ending 4

The Pigeon Fossil is the last payout of the skull door, but the real reward at 69 is the ritual: after the final skull, the door prepares a mysterious ritual (the Call From Beyond achievement territory), and completing it is the prerequisite that adds the Eat choice to the final fight against Queen Siraatsu — Ending 4. The full sequence, including the Banish/Eat choice, is laid out in the endings guide.