Abyss · Old Duke

Old Duke is the story layer on Calamity’s Depths Duke boss: a Sulphur Sea University marine archaeology authority and former colleague of Halibut. Dialogue uses the Sulphur Sea presentation style with a silhouette portrait.

Links to Halibut, legend, and systems

Link	Notes
Halibut	If Halibut is with you at first meeting, extra lines vouch for the professor
Halibut legend	Weapon trials are documented separately from this NPC arc
Commission system	Category Old Duke; Sulphur Sea tracker skin
The Forgotten Tome	Clears all progress and removes the current campsite

Flow overview

flowchart TD
  A[Summon or meet Old Duke NPC] --> B{First meeting}
  B -->|Accept cooperation| C[Friendly leave / campsite spawns]
  B -->|Decline| D[Can meet again and re-choose]
  B -->|Draw weapon| E[Permanent hostility / vanilla boss fight]
  C --> F[Commission 1: first camp talk]
  F --> G[Commission 2: collect 777 Ocean Scraps]
  G --> H[Turn in at camp → Ocean Devourer]
  H --> I[Shop / chat / spar / Merman's Perch relocate]

Single-player only: Old Duke story meetings and camp scenes run only in single player. Boss Rush skips story mode.

First meeting

Trigger: The local player becomes Old Duke’s target and the save has not yet locked in cooperate/fight branch. He flies above you and starts the meeting scene. First approach marks “met.”

Dialogue beats (official English):

• “Sheathe your bloodlust, youngster. There is no need for swords to be drawn the moment we meet.”
• Offers cooperation; collecting Ocean Scraps with worthwhile pay
• 1 Ocean Scrap sample before choices (click to claim)

Branches:

Choice	Outcome
Accept cooperation	Friendly leave; Old Duke’s campsite spawns in the world ocean
Decline cooperation	Dives away; can re-pick (“Have you changed your mind?”)
Decline and draw weapon	Battle; future meetings use boss logic

With Halibut: “The old professor…? Though, he doesn’t seem to recognize me.” — Halibut confirms his credibility as a university peer.

Commission chain

Both steps share the title “The Abyss Calls” under Old Duke in the commission panel.

Step 1 — Find the campsite

Field	In-game text
Summary	Find and speak with the Old Duke
Tracker	Go to the Old Duke’s campsite; distance in meters
Hint	Hold Ocean Fragments to see direction

Active when: cooperation accepted and the campsite exists in the world.

Complete: first long camp talk at the campsite.

Step 2 — 777 Ocean Fragments

Field	In-game text
Summary	Collect 777 Ocean Fragments
Tracker	Current count n/777; highlights return when ready
Hint	Fish or hunt ocean creatures

Active when: step 1’s first camp talk is done.

How progress counts

• Same pools as turn-in: inventory, four bank tabs (piggy, building, travel, team), and ImproveGame big bags.
• Tracker shows current/777 live; at 777, prompt to return to camp.
• Holding Ocean Scraps (commission UI calls them Ocean Fragments) shows direction toward camp (same as step 1).

How to farm scraps

Drops only after the campsite exists (see Ocean Scraps below):

Source	Rate / condition
Fishing	~1/4 catch replaced with scraps (not honey/lava pools)
Kills	Max life >100 in beach / Sulphur Sea / Abyss, ~1/4 drop

Turn-in

1. Go to Old Duke’s campsite, right-click to talk.
2. Choose “I brought the things you wanted.”
3. System checks combined total ≥777 across all counted storage; otherwise cannot submit.
4. On success, 777 are deducted from all pools and the completion scene plays.

Reward: Ocean Devourer ×1. Old Duke says he will spend the next few days deciphering the scraps; commission marks complete and the turn-in option disappears.

Old Duke’s campsite

After accepting cooperation, the world ocean gains Old Duke’s Campsite (map label). The scene includes the Duke, a pot, and flag decor; approach the camp and right-click to talk.

Once the camp exists, summoning the Duke again redirects you to camp dialogue instead of a field boss fight. During acid rain and similar states, lines may jump straight into spar-related branches.

“Defeat”: In story mode Old Duke cannot be killed; at 0 HP he dives away (“The Old Duke dove into the water…”) with drops preserved.

Ocean Scraps

A mysterious trinket. The Old Duke might be interested in it.

Inventory item name: Ocean Scraps. The commission panel labels the same item Ocean Fragments.

When farming starts

After cooperation and campsite spawn. The one sample from first meeting does not start the drop chain before the camp exists.

Source	Rate / condition
Fishing	~1/4 catch replaced (not honey/lava)
Kills	Max life >100 in beach / Sulphur Sea / Abyss, ~1/4 drop

Counted storage (progress, shop balance, and turn-in use the same pools):

• Inventory
• Four banks
• ImproveGame big bags

Uses: camp scrap shop currency; step-2 progress and submission.

Camp interaction

Right-click the camp Duke. Teleport visits may grant Teacup ×1 on first open.

While the 777 quest is active

Option	Effect
I am here to trade	Opens scrap shop
I brought the things you wanted	Needs ≥777 scraps; turn-in and completion scene
I want to spar with you	Friendly spar instance
Just wandering around	Ends talk

After completion

Turn-in option removed; trade, lore chat (“Tell me about your past”), spar, or leave. Busy line: “Hmm… Do you have any new discoveries? I am very busy right now.”

Chat topics

• Current state — abyss expedition, assimilation, guarding the sea
• Research — fragment memories, “killing rules,” sealing the abyss source
• Truth of the sea — Sapphire Sea → Sulphur Sea, dead civilization, corpse-sea warnings
• Fragments — mediums, clustering, collection goal
• Personal — sleep to dampen thoughts, solitude, abyss tea, “still a fish?”

Full lines are in-game under camp chat topics.

Scrap shop

Currency: Ocean Scraps (deducted from the same storage pools as quest counting).

Item	Scrap cost	Notes
Merman’s Perch	1	One per world; relocates camp to the rod
Ocean Devourer	220	Listed after 777 turn-in (quest already grants one)
Trident	15
Frost Staff	25
Bubble Gun	30
Flairon	45
Tsunami in a Bottle	20
Shark Tooth Necklace	12
Diving Helmet	8
Diving Gear	18
Jellyfish Necklace	15
Coral ×10	5
Starfish ×5	3
Seashell ×10	2
Shark Fin ×3	8
Gills Potion ×5	4
Sonar Potion ×5	3
Water Walking Potion ×5	3
Reef Block ×99	2
Seaweed ×20	1
Old Duke drops	dynamic	After Moon Lord or Plantera; price from item value

Merman’s Perch and camp relocation

• Buy for 1 scrap; only one perch per world
• +20 fishing power nearby; placing it moves the camp to that spot
• Leaving the new camp too far clears and regenerates the site elsewhere

Ocean Devourer

777 turn-in reward; also sold for 220 scraps after completion (quest already grants one).

• Place above water; consumes power to extract resources from the fluid
• Right-click opens internal storage; needs a power network

Old Chest

Decorative Old Chest with large storage; the item tooltip notes the Duke may toss items in when nearby. Optional camp flavor, not required for commissions.

Camp routing

After boss redirect to camp:

• If “find campsite” commission unfinished: “Come find me first. You’d best learn the path.”
• Otherwise: “I have business with you” → teleport to camp and open interaction, or “I was just fishing for fun…” to leave

During acid rain, redirect may jump straight into spar-related dialogue.

Progress

State	Meaning
Unmet / met / cooperating / declined / fought	First-meeting branch
First camp long talk done	Step 1 complete
777 collection registered	Step 2 in progress
777 submitted, Ocean Devourer received	Mainline complete

The Forgotten Tome resets all of the above and removes the campsite.