I just found a spacebar item called "Breath of Life", with the description "Invincibility at a cost." So what exactly does it do, and what is this "cost?"
What does the Breath of Life item do
the-binding-of-isaac-rebirth
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Best Answer
As per the comments, this item allows for the player to decide between a fixed rate of damage over time, or a possibly random rate, allowing for more control of your health.
This is taken directly from the new wiki entry: