Players can give treasures to the Wishing Well, in exchange for a chance for getting healed and curing Poison. The amount of health healed is equal to 125% of its percentage chance for successfully triggering the healing. For example, a Gold Nugget has an 80% chance to trigger healing, and will heal 100 when the effect occurs.
The End's Well can be found in a room of the Ancient Pig Ruins containing the Aporkalypse Calendar on the 5th island. It gives off a bassy, ambient humming sound effect and the water appears black.
The End's Well accepts Nightmare Fuel, spitting out either 1 or 3 Purple Gems. Other colored gems have a slight chance to cause the Well to spit out a Purple Gem. Giving any other item will result in a Shadow Creature spawning. This allows the player to turn a basic item into Nightmare Fuel, and Nightmare Fuel into an unending source of Purple Gems.
- By giving the End's Well an easily obtainable item like Twigs or Cut Grass, one could farm Nightmare Fuel by killing the Shadow Creatures. The Nightmare Fuel could then be turned into Purple Gems, which can be thrown back into the well to spawn more Shadow Creatures.
- Gold is much more effective than Tenpiece Oincs at regaining health from the well. This means that it is more efficient to use the Tenpiece Oincs to buy gold to throw in the well than to throw in the Tenpiece Oinc itself.
- The End's Well may be a reference to All's Well That Ends Well, a play by William Shakespeare.