Terraria 1.4 Ocean Lucky Coin and Slime Staff Money Farm Guide

How it works

You simply need to aggro enemies to death pit where your slimes from Slime Staff will slowly hit them to death and each hit will have a chance to generate coins with Lucky Coin.
(New aggro mechanics require mobs to be able to “see” you. You can’t have placed walls between your character and a mob. But I found out that you can have one sloped block placed and the enemy will still detect you. It’s still required to stand in fluid.)

Items you need and how they works

The Lucky Coin – is dropped by pirates during a Pirate Invasion at a rate of 1/4000 (0.025%) or from the Flying Dutchman at a rate of 1/200 (0.5%), but is not dropped by Parrots.

With the Lucky Coin equipped, there is a 1/5 (20%) chance that 1 to 10 extra coins will drop each time the player damages an enemy. Each time extra coins drop, the following probabilities determine the coin type:

• 89.1% chance for Copper Coins
• 9.9% chance for Silver Coins
• 1% chance for Gold Coins

The Slime Staff – generally has the rarest drop chance of any weapon, with minor exceptions. The typical drop rate from most slimes and Slimed Zombies is 1/10000 / 1/7000 (0.01% / 0.0143%). Pinky has a greatly increased drop rate of 1/100 / 1/70 (1% / 1.4%). Additionally, Sand Slimes have a drop rate of 1/8000 / 1/5600 (0.013% / 0.018%). The slimes which can not drop the Slime Staff are: Lava, Dungeon, Umbrella, Hoppin’ Jack, Corrupt, King Slime, Crimslime, Gastropod, Rainbow.

Summons from Slime Staff will do very small damage. Best modifiers are -x% damage. Broken modifier for example.

Tiki Armor, Pygmy Necklace, Necromantic Scroll and Papyrus Scarab will give us the ability to summon 8 slimes. Every Slime gives us a chance to drop coins. More slimes = more hits per second = more coins per second.

Useful accessories:

• Gold Ring – increases the player’s coin pickup radius to 25 blocks, instead of the normal 3
  block radius. Hardmode accessory that rarely drops from enemies exclusive to the Pirate
  Invasion, with the exception of Parrots.
• Treasure Magnet – increases the pickup range of all items by 9.5 tiles, and can be found
  in Shadow Chests as well as the Obsidian Lock Box.
• Void Bag – an item that grants access to the Void Vault. The Void bag is functionally the
  same as the Money Trough, however it picks up items when the players inventory is full, as
  indicated by purple pickup-text.

What is required:

• Some building blocks.
• Bubble blocks(Party girl is selling this in Hardmode). They are your biggest friend on this farm.
  They are blocking fluids from flowing and letting you move through them at the same time.
• Something that will give you water breathing (Gills potions, Neptune’s Shell/Moon
  Shell/Celestial Shell). You can try without this but it’ll be really painful.
• Lizhard blocks. This one is a bit optional. You can build without them but 81+ Lizhard blocks
  will create a jungle biome and spawn rate will be increased. This will give you mostly Arapaima
  spawns, they have high health and good defense stats so slimes will do 1 damage to them.
• Bucket.
• Water Candle (increase spawn rate by 33% and maximum number of simultaneous on-screen
  enemies by 50%).

Optional stuff (Things that will make your life easier):

• Mount with the ability to move underwater and fly infinitely.
• Summon with high damage for clearing mobs while you will be building.
• Bottomless Water Bucket and Super Absorbent Sponge.
• Architect Gizmo Pack

Overall look of the farm:
I will give you just a look on sizes of my farm and describe some important parts. Feel free to dezign it your unique way.
For most efficiency you need a flat place. From where your character will stand make a flat flor of 84 blocks left and right(168 blocks in overall).
Preventing spawning in caves below the farm will also help in longer farm runs. If there are caves You need to fill everything below the ocean floor, 50 blocks down. If enemies will be able to spawn in caves they can prevent more spawns in Ocean due to the maximum number of simultaneous on-screen enemies rule.

Here I will give a little advice. Don’t rush with placing Lizhard blocks. Try placing them last because the amount of Arapaimas that spawn will create more fight than you need during building progress.

Length of the farm

Bubble wall preventing Ocean to flow into farm and ceiling:

After placing the bubble block wall and ceiling you can get rid of water from inside of the farm. Just simply dig a shaft to caves below and let water to flow there. Then fill up the shaft with blocks again. Or simpler way is to use Super Absorbent Sponge if you have one.

Sloped walls going from sides of ceiling to the middle are important because they are blocking Arapaimas from jumping on your character but are still giving some view for aggro mechanics.

From the bubble wall there are bubbles with 1×2 tiles of water above the death pit on each side. Those are preventing Sharks from staying in the ledge.

Death pit:
10 depth pit should be enough for your slimes to not jump out. They will rarely jump out but it shouldn’t be a big deal.

Place for character to stand:
It can be filled with water as well. I like to fill it with Honey in case of taking some unexpected damage it will give some HP regen.
In Honey one block above bubble blocks there are placed platforms you can stand on.
On both sides there are sloped blocks placed evey 2 blocks. They are preventing Arapaimas to jump to you when they go full speed.

It’s not the best explanation on how to build but i think there is enough to see how it works and how it looks. When I’ll find some more free time I’ll try to provide screenshots from building progress on a new world, not from existing one.

There are some issues I’ve noticed. Random SolarEclipse event will kill you if you are AFK. There are mobs walking on background walls and mobs doing range damage.