Death of the Firstborn no longer breaks challenge rooms.

Balance changes:

• Plagues of Lice, Flies and Hail now tied to luck.
  
• This means at 10 luck, items will be as they were before, but are otherwise nerfed.
  
• Plague of Murrain now requires Isaac to be much closer (half the previous distance)
  
• Plague of Darkness is now a two heart devil item, and no longer appears in curse rooms.
  
• Plague of Murrain now appears in curse rooms.

Added the plague of boils. All costumes are complete now!

Recoded the plague of blood. (Now works properly in shops!)
Added costume to the plague of Frogs.

Added costume for the Plague of Murrain.
Plague of Locusts also now has a higher chance to spawn the locusts based on Luck.

Added costume for the Plague of Locusts.

Added costumes for Plague of Hail and Death of the Firstborn.

Added costumes for plagues of lice and flies.

Added costumes for the plagues of blood and darkness!
Big thanks to electoon for offering help!

Removed The Death of the Firstborn's damage on bosses. (It currently really breaks the boss rush for some reason.)