Terraria Bosses

In Terraria the hardest boss by far is the Moon Lord with a 145,000 H.P./health. 

The second most health boss is the Destroyer with 80,000 H.P. -- that is with all of the segments.  You have to destroy 30 of the segments to defeat the Destroyer.

The third is Duke Fishron with 50,000 H.P., and his moves are charging like crazy, moving into you fast, and spewing out bubbles that follow you, and spewing out bubbles while going around in a circle and moving into you fast multiple times.

The next one is Skeletron Prime, which has four arms but they do not have hands, but they do have weapons!!  Some of the weapons are like the Prime Saw, Prime Vice, Prime Laser, and the Prime Cannon.  Oh, and by the way, Skeletron Prime is just a metal skeleton head and four metal skeleton arms.

 And next is The Twins, which is two ginormous eyes.  The green eye is named Spazmitism, or for short "Spaz," and has 23,000 H.P.  The red eye is named Retinizer, or for short "Ret," with 20,000 H.P.

And I'm done.