What is the exact way to get Devil Deal Rooms?
I know the typical rule that if you don't lose any hearts (or red hearts if you have red AND white/silver/black hearts) you can get a Devil Deal Room after a boss fight, but something odd happened the last time I played.
I was playing as Eve (with the curse activated) and I only had the standard 3 red hearts. So I was battling one of those snake thing bosses on the first floor (with both the curse and Monstro's Lung which I had gotten earlier) and I lost a whole heart at one point but I still got a Devil Deal Room.
I don't know if I got it because I defeated it pretty fast or because the Eve character just has that attribute, but I'd like to know why so I can strategize when I play again.
Thanks!
Best Answer
According to the Rebirth wikia, there is only a 1% base chance for the Devil Room door to open. This chance can be increased in various ways:
This means that if you get damaged (this regards ONLY red hearts) during the boss fight you only decrease the chance to open a Devil Room, but there's still a small chance to find it anyway.
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How do you spawn the devil room?
Defeating a boss without taking red heart damage gives you a 99% chance to get a devil deal. There are a couple other triggers for that percentage, but they don't add as high a % to get the deal.How do you get Devil deals?
Conditions to Make Angel Rooms AppearHow do you consistently get angel rooms?
You have to donate all the coins at once. Each of the two Key Pieces (items you get from defeating Angels in Angel Rooms) provides a 25% increase to spawn an Angel Room. Donating to a Beggar or donating or killing a Devil Beggar increases the chance by another 25% (you can only get one of these bonuses).Binding of Isaac: Rebirth - How to get Angel \u0026 Devil rooms
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Answer 2
With pinckermans answer you know what factors influence your chances. But there is a handy overlay for Rebirth, which displays your current chance for a devil or angel deal (+ your other relevant stats).
It updates live, right when you pick up items, take damage etc. It's not really a mod, so it won't disable any achivements.
Link to the GitHub overview page
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Images: fauxels, Andrea Piacquadio, Andrea Piacquadio, Tima Miroshnichenko