Base probability = 1%lacktheknack said:I thought you got Devil Rooms from doing really well on bosses...trollax said:I wanted devil rooms! They have good items.But the next run after i fed ALL the beggars.lacktheknack said:WHAT DID THEY EVER DO TO YOU, YOU MONSTER?trollax said:In binding of Isaac I killed all of the beggars.
...BESIDES EAT ALL YOUR MONEY?
Add the following percentages:
Have one Pentagram: +20%
Have a second Pentagram (Confirmed): +10%
Have Book of Revelations: +35%
Have Book of Belial: +25%
Killed 1 or more beggars in current level: +35%
Took no damage in current level: +35%
Took no damage on the boss: percentage unknown but probably around 20-25%
Then multiply by one of these:
Met the devil in the current level or the level before: 0.25
Met the devil two levels ago: 0.5
Met the devil three or more levels ago, or never during the current run: 1.0
Right from The Wikia