The Abyssal Tonic is a consumable item in Fisch that lowers your pressure by 75 or more. It's especially useful when you're fishing in deep water where pressure is a challenge.
How to Unlock the Abyssal Tonic
To buy the Abyssal Tonic, you must first rescue the Lost Diver. Once you've completed this requirement, the item becomes available for purchase.
Where to Buy It
After rescuing the Lost Diver, you can purchase the Abyssal Tonic for in-game currency. The exact price is pending confirmation, but you'll be able to buy as many as you need once unlocked.
Why Use the Abyssal Tonic
Pressure is a mechanic that affects fishing in deeper zones. When pressure builds up during a fight with a fish, it becomes harder to keep your rod steady. The Abyssal Tonic instantly reduces pressure by 75+, giving you breathing room to land your catch or prepare for the next fight.