Minecraft Dungeons:Arena Battle

An Arena Battle (or ambush for short) is a battle between mobs and players.

Locations
Arena Battles occur in every location in the game except. Some locations have boss ambushes which spawn minibosses. Those locations include:

Behavior
Arena Battles behave differently from Boss Fights where Arena Battles spawn a lot more weaker mobs than sometimes a boss or two. Another is the battle format differs from boss fights, where it usually spawn in waves (like the one in Pumpkin Pastures). The battles usually start out as several weak mobs. Over time, the waves of mobs get stronger until the battle ends, or when the boss appears. No matter what, battles always spawn mobs that the level that it takes place in spawns.

There are similarities between arena battles and boss fights. They are both triggered by certain events like players entering the Arena (like the Redstone Mines battle) or by pressing a trigger (like the bell in the Pumpkin Pastures). Some other triggers include Buttons, Levers and Pillars.

There is a chance for these ambushes to have mini bosses. There are five levels where ambushes spawn two minibosses: the Basalt Deltas (DLC), the Crimson Forest (DLC), the Woodland Mansion (Secret, Ancient), The Stronghold (DLC) and the End Wilds (DLC). So far, it's not possible to have arena battles that spawn three bosses (apart from Ancient Hunts). Another similarity between Arena Battles and Boss Fights is that they have their own special music. They can also both be started by the Arch-Illager, the Jungle Abomination, the Wretched Wraith, the Tempest Golem, the Ancient Guardian and the Vengeful Heart of Ender, with each of them have their own summoning animation such as the Arch-Illager will teleport in, summon an ambush, and then teleport out. The Jungle Abomination, Wretched Wraith, Tempest Golem and Ancient Guardian will just roar to summon an ambush, producing their own effects while doing so. The Vengeful Heart of Ender often crawls near the player making hissing sounds to summon an ambush.

Battles are also usually announced by the game, like boss fights. When arena battles end, they usually spawn chests that contain the loot, whereas when boss fights end, their loot drops directly from the boss' corpse.

Mainland and Hero Pass DLC's

 * arena1 (Arena Music for the Creeper Woods, Pumpkin Pastures, Redstone Mines, Cacti Canyon, Obsidian Pinnacle, all Jungle Awakens levels, and all Creeping Winter levels)


 * arena2 (Arena Music for the Squid Coast, Desert Temple, Fiery Forge, Highblock Halls and the Underhalls)


 * Invocation (Arena Music for Woodland Mansion and Woodland Prison Ancient Hunts)


 * Menta Menardi (Arena Music for Spider Cave Ancient Hunt)

Howling Peaks

 * Summit (Arena Music for Windswept Peaks)
 * Ascension (Alternate Arena Music for Windswept Peaks)
 * Squall (Arena Music for Colossal Rampart)
 * Flurry (Alternate Arena Music for Colossal Rampart)
 * Rush (Arena Music for Gale Sanctum and Gauntlet of Gales)
 * Scud (Alternate Arena Music for Gauntlet of Gales)

Flames of the Nether

 * Routers (Arena Music for Nether Wastes, Nether Fortress and Gold Room Ancient Hunts)


 * Metaluna (Arena Music for Warped Forest and Soul Sand Valley)


 * Torn Acinder (Arena Music for Basalt Deltas)


 * Kermetic (Arena Music for Crimson Forest)

Hidden Depths

 * Cnidoblast (Arena Music for Coral Rise)
 * Nematocyst (Alternate Arena Music for Coral Rise)
 * Truched (Arena Music for Radiant Ravine)
 * Klyka (Alternate Arena Music for Radiant Ravine)
 * Swashes (Arena Music for Abyssal Monument)
 * Pit Fight (Alternate Arena Music for Abyssal Monument)

Echoing Void

 * Drawn (Arena Music for The Stronghold)
 * Closer (Alternate Arena Music for The Stronghold)
 * Nothingness (Arena Music for End Wilds)
 * Void (Alternate Arena Music for End Wilds)
 * Shattered (Arena Music for Broken Citadel)
 * Apart (Alternate Arena Music for Broken Citadel)

Trivia

 * There is one arena battle that behaves exactly like a boss fight: In the Redstone Mines where it spawns a Redstone Golem immidiately.
 * If the player escapes the arena while the music is playing, the music will keep going until another ambush or a boss fight is cleared.
 * The toughest ambush in the game is found in the Highblock Halls.