Okay, so y perspective on this task for my puzzle map boss fight:
You enter a dark, gigantic room with pillars to sprint on. With a bow and arrow you must shoot red eyes with pressure plates. The eyes will open and close in different sections, you will see them because there will be glowstone behind the pressure plates. Each time you hit a pressure plate, the HP Bar will go down. However, the HP Bar will restore itself slowly over about every 3 minutes. Lava will pour down on two of the five pillars every minute. Also, once boss fight is completed, A piston door will open, the lava will continue to fall every minute.
Note: I'm not sure if it will work, or just cause lag, however...I'm mostly concerned only over the HP Bar and the targets opening and closing. The room's dimensions I want to be 150 blocks wide and 350 blocks back. *TNT is behind boss to set off once completed.