Boss Monsters are NPCs found rarely in Terraria that are much harder to kill than other monsters. Any boss monster generally has much stronger attacks than a normal enemy, more defense, and considerably higher HP ranging from 1000 to 80000. In addition, most boss monsters have their own AI, allowing them set movements to go by. Since update 1.2, all bosses can drop a unique trophy (~10% drop rate) that can be placed on a wall for display.
Certain bosses occasionally summon themselves when the player(or all players on a multiplayer world) meets a certain criteria, differing with each boss. This will be announced with a creepy message at dusk, and about two minutes later the boss will spawn itself, even if the player is not ready, or even Eye of Cthulhu, the Destroyer, Skeletron Prime, and the Twins. The criteria and message for each boss can be found on their article.. The bosses that spawn themselves in this manner are the
Bosses in Alphabetical Order
|Arch Wyvern (, Mini, Hard)||Brain of Cthulhu||The Destroyer (Hard)||Eater Of Worlds|
|Everscream (Event, Mini, Hard)||Eye of Cthulhu||Golem (Hard)||Ice Golem (Mini, Hard)|
|Ice Queen (Event, Hard)||King Slime (Mini)||Lepus ( )||Mourning Wood (Event, Mini, Hard)|
|Ocram (, Hard)||Paladin (Mini, Hard)||Plantera (Hard)||Pumpking (Event, Hard)|
|Queen Bee||Santa-NK1 (Event, Hard)||Skeletron||Skeletron Prime (Hard)|
|The Twins (Hard)||Wall of Flesh||Wyvern (Mini, Hard)||Duke Fishron(Hard)|
- Main article: Eye of Cthulhu
Players can summon The Eye anywhere, as long as it is night. Sometimes when underground the player may see "You feel an evil presence watching you...", though the Eye will not spawn naturally whilst they are underground, and will instead spawn as soon as the player returns to the surface.
Boss 1 will play during the fight.
- Main article: Eater of Worlds
The Eater of Worlds has 53 parts in three segments; head, body and tail. To beat this boss all segments must be slain. If the head is destroyed, the next body segment will automatically take its place as a head. The same happens with the tail. If a body segment is destroyed, he will split into two separate worms. Overall, if the heads are avoided with a massive attack of 40 damage, the boss is fairly easy to defeat, especially with weapons that deal damage multiple times per strike, such as Vilethorn.
Boss 1 will play during the fight.
- Main article: Brain of Cthulhu
- Main article: Queen Bee
- Main article: Skeletron
After defeating Skeletron, the player will gain access to the Dungeon.
- Main article: Wall of Flesh
- Main article: The Twins
They have similar attack patterns to The Eye of Cthulhu, but their second forms use laser and demon fire attacks respectively. The two both need to be defeated to count as a boss kill. The Twins will spawn randomly in hardmode until they are defeated.
- Main article: The Destroyer
The Destroyer drops 15-30 Souls of Might and 5-15 Greater Healing Potions. Souls of Might are required to make keys to Biome Chests and weapons like Light Disc or Megashark. Getting the souls can sometimes be a problem, as if the Destroyer is defeated while mostly underground the Souls of Might may be dropped on top of blocks. The head drops the loot. If the head is in the air and you kill it the souls will be floating. A way you can find then is by looking for the loot that fell on the ground and then then go up to get the souls.
- Main article: Skeletron Prime
- Main article: Plantera
- Main article: Golem
- Main article: Duke Fishron
- Main article: Pumpking
The Pumpking is a Hardmode boss that spawns during the Pumpkin Moon. It behaves very similarly to Skeletron. It has two lengthy arms, each with a large scythe. These hands act much like Skeletron's hands, but they are indestructible.
It is considered the final boss of the Pumpkin Moon, and subsequent waves after its appearance increase the number of mobs. There can be a large number of Pumpkings attacking at once in the later stages (up to 6 active at the same time).
- Main article: Santa-NK1
- More info needed
Santa-NK1 is a boss added in the Christmas update. Like most bosses, it has two phases. It has four different attacks: rocket, main physical damage, bullets, and present care packages. The frost moon, and Santa-NK1, are summoned by using the Naughty Present.
- Main article: Ice Queen
- More info needed
The Ice queen is the Final Boss of The Frost Moon Event. The Ice Queen attacks with three phases. It could either swoop down quickly to touch the player, causing high damage to the player in a short time. Second, it could spin around while quickly spawning frost shards that go in random directions. These frost shards do decent damage, but if many of them hit the player, it could kill the player quickly. Another phase is that it could shoot frost waves that have high velocity and can go through blocks. It does quite high damage and is fired at a fast rate towards the player, so players might find this phase difficult. Once killed she has a 16.6% chance to drop one of the following: Snowman Cannon, North Pole, Blizzard Staff, Baby Grinch Mischief's Whistle, or Reindeer Bells.
- Main article: King Slime
The King Slime, as one might gather, is a slime. It is blue in color and enormous, roughly 10 blocks wide and 5 blocks high. It will decrease in size and spawn blue slimes when it takes damage. It appears to have a Ninja trapped inside it.
King Slime is summoned with the item Slime Crown, crafted with a Gold Crown and 99 gel at a Demon Altar. There has been a bug associated with the King Slime, sometimes causing the boss to not spawn/appear. This may be due to the fact that he spawned inside a cave and cannot get out.
The King Slime actually drops a little amount of Gel when he dies, and all of the blue slimes spawned when the King Slime is attacked also drop gel. The King Slime also drops gold coins, a piece of the Ninja Set and some lesser healing potions.
The King Slime is the biggest slime in the game so far.
- Main article: Ice Golem
Ice Golems are an Uncommon miniboss. They spawn in Snow Biomes after activating Hard Mode, during a Blizzard. They will spawn more often during a Blood Moon. Ice Golems are hostile and thus attack the player. While they are able to deal damage by physical contact, they are very slow and will shoot at the player with lasers from afar, which also have a chance to cause a debuff. They are affected very little by knockback, but have a low jump height of only about 3 blocks.
- Main article: Wyvern
The Wyvern is a large Hard Mode Mini-Boss. It is a curling, dragon-like creature that attacks at high speed.
Wyvern is not summoned - it occasionally spawns in the sky, around the same point that Harpies spawn. It spawns without warning, so the player should be careful when they are at a high elevation in hardmode.
- Main article: Paladin
The Paladin spawns rarely in Hard Mode Dungeons. It throws hammers that will go through walls at the player and will try to walk into the player. When taking constant damage it will stop throwing hammers, but will still walk towards the player, as it is unaffected by knockback.
- Main article: Mourning Wood
Mourning Wood are monsters that spawn during the Pumpkin Moon event. They shoot flaming projectiles that deal considerable damage to the player. Mourning Wood have 3 different kind of attacks: shooting fire projectiles that pierce through solid objects, spraying a cluster of lingering flames onto the ground, and hurting the player by touch.
The best strategy for taking out Mourning Wood is to used ranged attacks, as their piercing shots come at random intervals and are difficult to dodge. Ranged, Magic, or high knockback weapons are recommended.
- Main article: Ocram
The Ocram's attack style is very similar to that of the Eye of Cthulhu. Like the Eye of Cthulhu, it charges repeatedly at the player while summoning servants. Additionally, it fires numerous red laser beams which spread out. The Ocram has in total 35,000 HP and after knocking its health down to halfway, it will (like most bosses) switch into its second mode, where it continues to summon servants, but will charge constantly and the laser changes to a blue, more damaging laser which spray out at an insane rate. Ocram also uses the demon scythe spell summoning several demon scythes at once doing a fair amount of damage. Souls of Blight are Souls dropped by Ocram. It would take 205 Souls to make all the relevant items. The Ocram needs to be defeated 7 to 14 times in order to craft all of the relevant items using the Souls of Blight, however, since it will always drop one piece of the console-exclusive armour, it means you will need 15-20 less souls saving you a few Ocram fights. As of console 1.2, it now drops it's own trophy.
- Main article: Arch Wyvern
The Arch Wyvern is a type of Wyvern found in console Hardmode. With double the health of a normal Wyvern (8000HP) and a damage output of 70-90 damage, the Arch Wyvern is a fearsome foe. It can go through blocks, but if the character walks too far away from it the Arch Wyvern will despawn. Even though it has twice as much health as the regular wyvern it still has the same amount of drops.
- Main article: Lepus
Lepus is the first mobile-exclusive boss, secretly added in 1.1.8 and revealed in 1.1.91. It is summoned using a Suspicious Looking Egg, a drop from Diseaster Bunnies and Corrupt Bunnies. It has 2000 health and approximately 20 attack and 12 defense. It shoots eggs which spawn Lepus clones and Diseaster Bunnies. It is the only source of Greater Healing Potions in mobile Terraria, and it also drops items such as the Boots of Ostara and the Egg Cannon. Due to a bug, Lepus will also occasionally drop Souls of Might.
- Bosses will follow the character and kill the NPCs if they get close to them.
- There is an upcoming boss currently known simply as the Lunar Boss. Nothing is known about this boss as of now, but the boss theme has been released with the Terraria Soundtrack Vol. 2.
- The Bosses' "roars" can be heard not only when they are summoned but also when they do an attack unique to them. (ex. When the Queen Bee charges from one side of the player to the other or when Skeletron spins his head)