

Assassin's Creed: Rogue, being something of a Mission-Pack Sequel to Black Flag, copies the latter's four legendary ship battles, only this time it's against entire fleets led by a souped-up flagship.Defeating all five ships gives the Jackdaw the El Impoluto's boosted ram attack, but then again, by that point there's not much left to use it on. You win 20,000 Reales for winning each fight, but by that point you've probably bought all the ship upgrades you needed to actually beat them, so it's more of a Bragging Rights Reward. In Assassin's Creed IV: Black Flag, there are five legendary ships that you can fight in any of the four corners of the map: The HMS Prince, who will pester you from afar with mortar shots, La Dama Negra, who can only be fired at from behind, The HMS Fearless and The Royal Sovereign, who will surround and double-team you, and the infamous El Impoluto, who uses her greater speed and maneuverability to ram your elite hull armor to oblivion.Defeating them usually comes with valuable rewards like large sums of money, special abilities, and most often top-tier equipment, but some reward nothing but personal satisfaction and bragging rights. The Assassin's Creed franchise introduced bonus bosses starting with Assassin's Creed IV: Black Flag.He's well-hidden, and you don't actually fight him - instead you play, well, Simon Says, with a very useful third cooking slot as your reward for playing well. Aquaria has a number of optional bosses, but many consider Simon Says to be the most interesting.If a late-game boss has multiple difficulty levels, expect the absolute highest level to be considered a bonus boss, if not the True Final Boss. Their usual habitat is the end of a Bonus Dungeon, Brutal Bonus Level, sidequest, or Boss Rush. The key features are that defeating one isn't necessary to complete the game, and they require quite a bit of conscious effort to find. There's no real limit to the number of bonus bosses you can fight Final Fantasy X had dozens of them cordoned off in the optional (and highly incongruous) Monster Arena. Another common nickname for them is "Superboss." Sometimes this is justified with an in-universe explanation, but more often than not, it's a glaring example of Giant Space Flea from Nowhere, which itself is a subtrope of Gameplay and Story Segregation. They typically aren't directly connected with the main plot of the game, even if their world-ending strength rivals that of the Final Boss.

The Bonus Boss is a type of Optional Boss which serves to test players' mettle.
