Base completion reward
240 MarksBefore the tier multiplier. Your tier settings can change this amount.
Expeditions / Field guide
Overworld expedition · Challenging
The Sunken Aqueduct
A timed run up a drowned valley. Cross the Long Span, stop Old Bess in the Pump House, hold the Cistern while it floods, get past the chief engineer in the Pressure Gallery, weigh down the floodgates and face the Tidewarden at the foot of the Great Dam. A stair down the bastion's west tower leads to the Silt Bed, if you have the time.
- Entry level
- 16Higher tiers may require more
- Party size
- 1–5Players per private instance
- Time limit
- 14 minComplete the run before time expires
- Route
- 6 rooms4 boss encounters
- Old BessThe Pump House
- Chief Engineer HollisThe Pressure Gallery
- The Silt MotherThe Silt Bed · Optional
- The TidewardenThe Tidewarden's Basin
01 · Before you enter
Prepare your party
On a run-back tier nobody runs out of lives: if you fall, you come back at the last fire you lit, and if the whole party falls the fight resets. On tiers with shared lives, each death spends one. You keep your gear either way.
- The clock is the danger. You start with fourteen minutes and every cleared room adds more, so don't wait for stragglers.
- Old Bess can't be hurt while her valve drones run. When the last one stops she takes double for twelve seconds, so save your big hits for then.
- In the Pump House, watch the valves light up in order on the west wall. A wrong one resets the sequence.
- The Cistern floods block by block. Keep moving, and step out of the rings.
- Throw anything onto the floodgate plates. A dropped item keeps a plate down.
- Bog Oracles heal their friends. Hit them hard while they channel to stop the heal.
- The bollards in the Tidewarden's basin are there for a reason. Water doesn't go through stone.
Choose your difficulty
Open a tier for its requirements, modifiers and server records. Every party member must meet its entry requirements.
NormalLevel 16 · run back when you fall
- Shared lives
- None needed
- Completion Marks
- 240
- Server clears
- 0
No additional modifiers on this tier.
Fastest server clearNo clear recorded
/expedition start sunken_aqueduct normalNeed a party? Use /expedition queue sunken_aqueduct normal.
HeroicLevel 24 · run back when you fall
First clear this expedition on Normal.
- Shared lives
- None needed
- Completion Marks
- 360
- Server clears
- 0
No additional modifiers on this tier.
Fastest server clearNo clear recorded
/expedition start sunken_aqueduct heroicNeed a party? Use /expedition queue sunken_aqueduct heroic.
MythicLevel 32 · 3 shared lives
First clear this expedition on Heroic.
- Shared lives
- 3
- Completion Marks
- 600
- Server clears
- 1
- TimedFinish within the par time for an extra loot roll.
- FortifiedRegular enemies have 30% more health and hit 15% harder.
Fastest server clearNo clear recorded
/expedition start sunken_aqueduct mythicNeed a party? Use /expedition queue sunken_aqueduct mythic.
02 · Room by room
Follow the route
The Pump House
BossOld Bess, a pump engine on piston legs. She calls four valve drones and can't be hurt until they stop, then she's open for twelve seconds. Below half, steam vents along the floor. Turn the three valves in the order shown to open the stair.
The Cistern
Survive 55sHold a minute while the water rises, geysers burst and the drowned keep coming.
The Pressure Gallery
BossChief Engineer Hollis. When a tank's valve starts to go, break it within ten seconds, or the tank bursts, hits the whole party and makes him stronger. It stacks.
Floodgate Control
PassageSluice Keepers chain and freeze you. Weigh down both plates with counterweights from the supply crate.
The Silt Bed
Optional bossOptional, down the bastion's west tower. Killing the Silt Mother gives the whole party speed and protection for the rest of the run, and she has her own loot. She drags a line of mud through someone, binds two players with roots so they have to stay close, and in the second half wakes the bed ring by ring.
The Tidewarden's Basin
BossThe Tidewarden, at the foot of the Great Dam. See the boss briefing.
03 · Spoils
What the bosses leave
Every boss leaves a chest where it falls. Each of you opens it for a private share, rolled for you alone: materials, often a piece of the dungeon's gear, and a chance at something of that boss's own. The list below runs from the likeliest piece to the rarest.
- Normal
- 35%chance of a boss's own piece
- Heroic
- 47%chance of a boss's own piece, +6 item levels
- Mythic
- 60%chance of a boss's own piece, +12 item levels
Boss · The Pump HouseOld Bess5 pieces
- Stoker's BracersWrists · item level 18
Health: +2 · Defense: +3
- Boilerplate GirdleWaist · item level 18
Health: +2 · Defense: +3
- Beam-Engine GreavesLegs · item level 18
Health: +4 · Defense: +6
- Old Bess's Safety ValveTrinket · item level 19
Health: +4 · Damage Bonus: +2%
Equipped: Last Stand. Below 30% health, you harden against hits for 5s. 60s cooldown.
- Flywheel MaulMain hand · item level 19
Damage: +7 · Damage Bonus: +2%
On Hit: Thunderclap. Lightning shocks nearby enemies for 60% of the hit. 15% chance, 10s cooldown.
Boss · The Pressure GalleryChief Engineer Hollis4 pieces
- Chief's GauntletsHands · item level 19
Defense: +3 · Bonus Damage: +2
- Pressure CollarNeck · item level 19
Health: +5 · Damage Bonus: +1%
- Boilerplate GirdleWaist · item level 18
Health: +2 · Defense: +3
- Chain of the Water GuildShoulders · item level 20
Defense: +5 · Damage Bonus: +2%
Equipped: Ember Aura. Enemies within 3 blocks burn.
Optional boss · The Silt BedThe Silt Mother3 pieces
- Siltscale HelmHead · item level 19
Health: +4 · Defense: +5
- Rootbind BandRing · item level 19
Health: +4 · Defense: +1
- MudwalkersFeet · item level 20
Health: +3 · Defense: +4
Equipped: Fleet Stride. You move faster.
Boss · The Tidewarden's BasinThe Tidewarden5 pieces
- Mantle of the TideBack · item level 20
Health: +7 · Defense: +2
Equipped: Last Stand. Below 30% health, you harden against hits for 5s. 60s cooldown.
- Dam-Keeper's RingRing · item level 20
Health: +4 · Damage Bonus: +3%
Equipped: Ember Aura. Enemies within 3 blocks burn.
- Floodgate BulwarkOff hand · item level 20
Health: +2 · Defense: +7
Equipped: Last Stand. Below 30% health, you harden against hits for 5s. 60s cooldown.
- Urn of the Great DamTrinket · item level 21
Health: +6 · Damage Bonus: +3%
Equipped: Ember Aura. Enemies within 3 blocks burn.
- Tidewarden's TridentMain hand · item level 22
Damage: +9 · Projectile Damage: +9 · Life Steal: +2%
On Hit: Thunderclap. Lightning shocks nearby enemies for 60% of the hit. 15% chance, 10s cooldown.
Gear for every slot
Set pieces can be found or forged. Found pieces turn up anywhere in the run: on enemies and in crates, chests and hidden caches.
- Head
- Tidebound HelmSetSiltscale HelmThe Silt Mother
- Shoulders
- Span-Walker's PauldronsFoundChain of the Water GuildChief Engineer Hollis
- Chest
- Tidebound CuirassSet
- Back
- Oilskin CapeFoundMantle of the TideThe Tidewarden
- Wrists
- Gasket CuffsFoundStoker's BracersOld Bess
- Hands
- Wright's GlovesFoundChief's GauntletsChief Engineer Hollis
- Waist
- Tool-Loop BeltFoundBoilerplate GirdleOld BessBoilerplate GirdleChief Engineer Hollis
- Legs
- Tidebound GreavesSetBeam-Engine GreavesOld Bess
- Feet
- Tidebound BootsSetMudwalkersThe Silt Mother
- Neck
- Plumb Line PendantFoundPressure CollarChief Engineer Hollis
- Ring
- Guild WasherFoundRootbind BandThe Silt MotherDam-Keeper's RingThe Tidewarden
- Trinket
- Brass FloatFoundOld Bess's Safety ValveOld BessUrn of the Great DamThe Tidewarden
- Main hand
- Sluicebreaker TridentSetFlywheel MaulOld BessTidewarden's TridentThe Tidewarden
- Off hand
- Gatekeeper's RoundelFoundFloodgate BulwarkThe Tidewarden
04 · Bestiary
Enemies & possible drops
Health and damage are base values, before level, tier and party scaling. Drop chances apply to each player kill; they are separate from boss chests and completion rewards.
Boss · The Pump HouseOld Bess620 HP · 8 damage
| Item | Amount | Chance |
|---|---|---|
| Sluice Cog | 1–3 | 100% |
| Tidewarden's Scale | 1 | 35% |
| Tidewarden's Trident | 1 | 4% |
| Coin purse (Marks) | 75–125 | 100% |
Boss · The Pressure GalleryChief Engineer Hollis640 HP · 9 damage
| Item | Amount | Chance |
|---|---|---|
| Sluice Cog | 1–3 | 100% |
| Tidewarden's Scale | 1 | 35% |
| Tidewarden's Trident | 1 | 4% |
| Coin purse (Marks) | 75–125 | 100% |
Boss · The Silt BedThe Silt Mother620 HP · 9 damage
| Item | Amount | Chance |
|---|---|---|
| Sluice Cog | 1–3 | 100% |
| Tidewarden's Scale | 1 | 35% |
| Tidewarden's Trident | 1 | 4% |
| Coin purse (Marks) | 75–125 | 100% |
Boss · The Tidewarden's BasinThe Tidewarden860 HP · 9 damage
| Item | Amount | Chance |
|---|---|---|
| Sluice Cog | 1–3 | 100% |
| Tidewarden's Scale | 1 | 35% |
| Tidewarden's Trident | 1 | 4% |
| Coin purse (Marks) | 75–140 | 100% |
Enemy · The Cistern, The Pressure Gallery, Floodgate Control, Standing guardDrowned Sluicehand30 HP · 5 damage
| Item | Amount | Chance |
|---|---|---|
| Tidepearl | 1–2 | 25% |
| A piece of gear (may be sealed) | 1 | 1.2% |
| Bottled Lesson | 1 | 1% |
| Coin purse (Marks) | 1–4 | 20% |
Elite · The Cistern, Floodgate Control, Standing guardBog Oracle34 HP · 4 damage
Shockwave: 4 damage within 5 blocks every 12s. A ring marks it first; step out. Mend: Heals itself and wounded allies around it. A charged hit stops it. Poison Cloud: Leaves a lingering cloud of poison. Move out of it.
| Item | Amount | Chance |
|---|---|---|
| Tidepearl | 1–3 | 70% |
| Sluice Cog | 1 | 25% |
| A piece of gear (may be sealed) | 1 | 7% |
| Bottled Lesson | 1 | 5% |
| Coin purse (Marks) | 12–20 | 100% |
Elite · The Cistern, Floodgate Control, Standing guardSluice Keeper50 HP · 6 damage
Tether: Chains the nearest player and drags them in. Break line of sight to snap it. Frost Nova: Freezes and slows everyone close by. Keep your distance.
| Item | Amount | Chance |
|---|---|---|
| Tidepearl | 1–3 | 70% |
| Sluice Cog | 1 | 25% |
| A piece of gear (may be sealed) | 1 | 7% |
| Bottled Lesson | 1 | 5% |
| Coin purse (Marks) | 12–20 | 100% |
Enemy · The Cistern, The Pressure Gallery, Standing guardDrowned Pumpwright30 HP · 4 damage
Soul Bolt: Hurls a bolt at whoever it's fighting. A charged hit stops it.
| Item | Amount | Chance |
|---|---|---|
| Tidepearl | 1–2 | 25% |
| A piece of gear (may be sealed) | 1 | 1.2% |
| Bottled Lesson | 1 | 1% |
| Coin purse (Marks) | 1–4 | 20% |
Enemy · The Silt Bed, Standing guardSilt Crawler28 HP · 5 damage
Leap: Leaps onto a far player and stuns everyone near the landing spot.
| Item | Amount | Chance |
|---|---|---|
| Tidepearl | 1–2 | 25% |
| A piece of gear (may be sealed) | 1 | 1.2% |
| Bottled Lesson | 1 | 1% |
| Coin purse (Marks) | 1–4 | 20% |
Enemy · The Tidewarden's Basin, Standing guardTide Witch60 HP · 4 damage
Frost Bolt: Fires a bolt of frost you can see coming at a marked spot. It leaves ice that slows anyone on it.
| Item | Amount | Chance |
|---|---|---|
| Tidepearl | 1–2 | 25% |
| A piece of gear (may be sealed) | 1 | 1.2% |
| Bottled Lesson | 1 | 1% |
| Coin purse (Marks) | 1–6 | 20% |
Enemy · Standing guardDeep Guard70 HP · 7 damage
Cleave: Winds up, then sweeps everything in front of it. Step behind or out of the arc. Charge: Lowers its head, then rushes the farthest player in a line, knocking aside anyone in the way.
| Item | Amount | Chance |
|---|---|---|
| Tidepearl | 1–3 | 70% |
| Sluice Cog | 1 | 25% |
| A piece of gear (may be sealed) | 1 | 7% |
| Bottled Lesson | 1 | 5% |
| Coin purse (Marks) | 1–7 | 20% |
No enemies or drops match your search.
05 · Finish the expedition
What you take home
Players present at completion receive their own rewards. Enemy drops listed above are additional chances, not guaranteed completion items. Runs with hired allies do not earn campaign progress or set expedition records.
Fixed completion items
- 12 × Prismarine shard
- 1 × Heart of the sea
- 4 × Experience bottle
These items are separate from random loot rolls.
/expedition guide sunken_aqueduct