Frost Legion

The Frost Legion is an event when unique Snowman enemies spawn and swarm a player's Town, similar to the Goblin Army. The Frost Legion only occurs when the player uses a Snow Globe to summon it.

Initial event
When a Frost Legion is summoned, a message will appear: The Frost Legion is approaching from the [east/west]!

The direction specified in this message only pertains to the initial wave of Snowmen, which spawns at the World's edge and travels to the player's original spawn point. Additional waves spawn immediately within the player's original spawn area. If the message says "West", the Snowmen will come from the left. If the message says "East", they'll arrive from the right. Note that these directions are not related to the apparent motion of the Sun and the Moon, which, in Terraria, appear to move from left ("west") to right ("east").

When the Frost Legion is about to begin spawning around the player's spawn point, the following message appears: The Frost Legion has arrived! and the theme music will switch to the "boss fight" theme.

Completing the event
The event is completed when the player(s) defeat all Snowmen in the legion.

When the final wave of Snowmen is on the screen, a message will appear saying, "The Frost Legion has been defeated!", and the theme music will return to normal.

Once defeated, Santa Claus will be available as an NPC and will move into an empty home. Note that it is irrelevant whether the world is in hardmode or not to spawn the Frost Legion and thus acquire the Santa NPC.

Snowman types
The legion will be made up of the following Snowman types:
 * Mister Stabby: A Snowman wielding a knife.
 * Snowman Gangsta: A Snowman that inflicts ranged damage with a gun.
 * Snow Balla: A Snowman that throws snowball projectiles.