Polarities Mod/Skeletron 2: Electric Boogaloo

Skeletron 2: Electric Boogaloo is a Hardmode book that is purchased from the for  after Skeletron Prime is defeated. When used, it grants the player 9999 defense, making them only take 1 damage from any attack. However, taking that hit will remove the added defense for three minutes. This timer is hard-coded, cannot be refreshed by removing the buff and re-using the book, and is shared with.

Trivia

 * Its title references the 1984 dance film Breakin' 2: Electric Boogaloo, and more specifically the meme it spawned of using "Electric Boogaloo" to refer to unnecessary and/or low-quality sequels.