Lucifer

About
The final Prince of Hell, and the final boss of the Infernal Castle.

At this point of the game, the enormous amount of LP is unsurpassed by any other linear bosses (Though some bonus bosses have had more). Since there are no weaknesses to exploit, this battle might take a long time.

Once every seven seconds, Lucifer will spawn 7 clones that don't attack. These can be a nuisance, however, as they distract the stickmen from their actual target. No clones will be spawned if there are already 7 present.

Lucifer will occasionally fire 7 lasers in 7 directions. The lasers deal 77-111 damage and bounce off walls. It's best to absorb the hit with a tank stickman, as the lasers will never dissipate.

When stickmen come within a 50 pixel radius of Lucifer, he will slowly spawn a pentagram shield, preventing melee stickmen from landing hits without sustaining serious damage.

Once defeated, any remaining clones automatically suffer 7777 points of damage, inevitably killing them.