Bosses

Bosses are strong monsters with substantial amounts of HP (Health) and are capable of massive amounts of damage if a player is not prepared.

There are currently 3 Boss monsters in Terraria, each with its own special way to be summoned and 2 of the 3 also having a special item a player can summon it with.

The items used to summon Boss monsters can only be crafted at special Demon Altars found underground and in the corruption using items dropped by the smaller/similar monsters.

A Player will rarely be attacked by a boss monster without warning. Every boss must be either summoned by the Player or will be preceded by a message displayed for the player letting them know something bad is going to happen and to prepare. (You feel an evil presence watching you, Chills run down your spine etc.)

Exterminating a boss concludes with a congratulatory message and several items.