Related

Location
Castles
HP
1
Notes
Will sometimes steal your highest-tier unequipped weapon when adjacent; drops the key to a random prison cell
Killing the Jester gets you a key to one of the castle prison cells, but it also makes the Guards attack you. Whether you get the key to the Princess's cell is random, and the only way to find out is to try to open it.
The Jester will randomly decide to steal Weapons if you happen to be standing in an adjacent square, much like Bards in towns. The Weapon stolen is the best one in your inventory, though Jesters can't steal the Weapon you have equipped. (They can steal extra copies of it, however.)
The Jester will randomly decide to steal Weapons if you happen to be standing in an adjacent square, much like Bards in towns. The Weapon stolen is the best one in your inventory, though Jesters can't steal the Weapon you have equipped. (They can steal extra copies of it, however.)
Location
Castles
Notes
Will sometimes steal all of your unequipped weapons when adjacent; drops the key to a random prison cell
Killing the Jester gets you a key to one of the castle prison cells, but it also makes the Guards attack you. Whether you get the key to the Princess's cell is random. You can check your inventory to determine which key you got—you want the key to cell #2.
The Jester will randomly decide to steal your Weapons if you happen to be standing in an adjacent square, much like Bards in towns. They will steal all of your reserve Weapons, so try not to give them the chance. If possible, use a ranged Weapon to kill a Jester so you don't have to get near them.
The Jester will randomly decide to steal your Weapons if you happen to be standing in an adjacent square, much like Bards in towns. They will steal all of your reserve Weapons, so try not to give them the chance. If possible, use a ranged Weapon to kill a Jester so you don't have to get near them.

Appears on
This creature does not appear randomly
Jesters generally wander around being annoying, but can almost always be ignored. The notable exception is in New Jester, where a horde of Jesters will try to corner you, forcing you to fight your way out. There's really nothing good that can come of dealing with Jesters anywhere.