Skeletrain

Skeletrain is a boss that can be summoned by "uncursing" the Clockwork Old Man. This is a mix between The Destroyer and Skeletron Prime. When Skeletrain loses an arm, it regrows in 20 seconds. Skeletrain will start off with 4 arms. 2 of the arms are grenade launchers, and the other 2 are laser shooters. Skeletrain looks like The Destroyer with Skeletron Prime arms.

Stats
148000 (48000 HP for each arm)

70 defense

120 laser damage(150 on second form, 200 on third form, also inflicts On Fire! debuff on first and second form)

100 arm damage

130 grenade damage.

First form
When Skeletrain has full health, Skeletrain will begin shooting lasers every 5 seconds. These do 120 damage. Skeletrain's grenade launcher will also shoot grenades every 7 which deal 70 damage. These act exactly like Skeletron Prime's grenades- expect this time dealing more damage.

Second Form
When Skeletrain has 112000, Skeletrain will begin shooting lasers every 3 seconds that inflict the On Fire! debuff for 10 seconds and deal 150 damage. Skeletrain will also now start shooting grenades every 5 seconds.

Third Form
When Skeletrain has 11200, Skeletrain will also now begin to spawn probes every 2 seconds and will begin shooting lasers every 2 seconds and will now deal 200 damage.

Drops
One of the following will drop:

Danger Zone (Sword),

LandShark (Gun)