Megaskeltron

Megaskeltron (Meg-a-skel-tron)
Megaskeltron is a boss and is a direct upgrade to Skeletron prime. He has 8 arms, which are Mega vice, mega saw, mega laser, mega cannon, mega axe, mega sword, mega chainsaw and mega chaingun. It spawns with the message:  Fear crouds every nerve of your brain....

Mega axe
Hp; 21,230

Damage: 82

Behaveour
Will make a swipe at the player than retrea for 2s, then make another swipe.

Mega sword
Hp: 16,595

Damage: 13

Behaveour
Will stay in the players way, making you run into it.

Mega chainsaw
Hp: 18,000

Damage: 4

Behaveour
Will stay right on top of your head and deal damage extremly fast.

Mega chaingun
Hp: 18,120

Damage: 2

Behaveour
AI makes it have to stay out on your way and fire. Using ranged weapons is your only hope.

Megaskeltron
Hp: 70,490

Damage: 57

Behaveour
Will retreat but make sure that its arms can get to you. It is possibly to meleely attack it.

Crafting summoner
2 mechanical skull, 50 iron, 35 souls of fright and 8 bones= Commando skull

Forms
It only has one form. It will behave as listed above. The other arms are the same as skeletron prime.

Drops
One of the following will drop. After that there is a chance something else may drop:

Skull o' doom, 10%

Mega chainsaw, 10%

Materializer, 10%

Mega souls of fright 10-15, 100%

MechSteel 20-25, 100%

Megaskeltron trophy, 10%

Megaskeltron mask, 10%

Trivia
Megaskeltron is a boss made by Mecharia, Inc. to dominate terraria and 'mechanicalize' it.