If you are new to this: be ABSOLUTELY CERTAIN you are in 1.11.2 and not 1.12

For Phase IV, the most complex one, you will find an iron cross on the floor in the center of the room, standing on it gives you voltage but also gives you a bow and an arrow, shoot the iron, gold, and diamond blocks with your bows and hit the buttons, when you do this you will beat the section. However it isn't that simple, when you reach 1000 voltage you will be slowed, and when you reach 2000 you will die, and dying send you to a parkour section to redeem yourself, you can also die to the withering effect that happens often and is only gone when in the parkour. You may notice that your health is gone because of this and the solution is stained glass to the right of the center iron cross, it will give you regeneration and saturation, but will also give you voltage... As for this pesky Voltage that keeps climbing the way to remove it is simple, stand on the regular glass to the left of the Iron cross, however that doesn't protect you from the withering so you must balance which one you are on and when. Once you have found the timing of shooting, to taking off voltage, to regenerating, back to removing voltage and shooting again, and after you have finished all three levels (iron, gold, and diamond) the Perfected Entity is destroyed and you must now set the charges on the iron for Phase V