Structures
Six kinds of structure stand in the Swift. The creatures in each one appear the first time a player comes close, and they only appear once.
Arrival gate

A reinforced deepslate portal on a plaza of polished swiftstone, created the first time you arrive. Four dormant echo golems stand guard in front of it, facing away from the gate. It links back to the portal you came through.
| Found in | Wherever you arrive through a Deep Dark portal |
|---|---|
| Inhabitants | Four dormant echo golems |
Lullaby Circle

A ring of five dormant echo golems around a raised dais of chiseled swiftstone with a Soul Block on top. Play a note block nearby and the whole circle wakes up.
| Found in | Swift Meadows and White Willow Grove; common |
|---|---|
| Inhabitants | Five dormant echo golems |
| Loot | The Soul Block on the dais |
Harmonizer Grove

A henge of eight red spires around a giant goldfrond bloom. The Harmonizer and three sprouts appear the first time a player comes close.
| Found in | Swiftstone Spires; rare |
|---|---|
| Inhabitants | The Harmonizer and three sprouts |
| Loot | The Harmonizer’s drops |
Monstrosity Lair

A sunken bowl of sculk under arches of bone. The Sculk Monstrosity rises from it, with two sculk cubes, the first time a player comes close.
| Found in | Carapace; rare |
|---|---|
| Inhabitants | The Sculk Monstrosity and two sculk cubes |
| Loot | The Monstrosity’s drops |
Monarch Court

A walled, circular arena with four pools of ichor and a throne. Two Monarchs and four sculk slashers are waiting inside when a player first comes close.
| Found in | Carapace, Swiftstone Spires and Swift Meadows; rare |
|---|---|
| Inhabitants | Two Monarchs and four sculk slashers |
| Loot | The Monarchs’ drops |
Illager Soul Excavation

An illager camp mining the Swift for its souls: a pit of Soul Blocks, tents, a campfire, barrels, a banner and a supply chest. The illagers appear the first time a player comes close.
| Found in | Swift Meadows, Swiftstone Spires and White Willow Grove; uncommon |
|---|---|
| Inhabitants | Two vindicators and three pillagers |
| Loot | Soul Blocks in the pit. The chest holds 1–3 Soul Blocks, 3–8 emeralds, 8–16 arrows, 2–5 iron ingots, 1–3 swiftling scales and 4 bread, sometimes a crossbow, and rarely the Lullaby music disc |