Bonze Marberry is a Notorious Monster from Final Fantasy XI: Rise of the Zilart. He is encountered as part of Windurst Mission 7-2: Awakening of the Gods, for which the player must acquire the Cursed Keys he drops.
In addition to its standard Tonberry abilities, Bonze Marberry can also use Everyone's Rancor at 25% health, a powered up version of Everyone's Grudge which deals damage equal to 50 times the amount of tonberries killed by the player. This makes it vital for the player to complete a sidequest to reset their "tonberry hate" to zero, otherwise it is very likely they will be killed by Everyone's Rancor.