Blood Oath - Binding of Isaac: Rebirth Wiki
...If Isaac has half a red heart or less, the effect will not trigger, even if Isaac has soul/black hearts. Blood Oath also drains the health of Keeper / Tainted Keeper, leaving their health at one coin heart....
https://bindingofisaacrebirth.fandom.com/wiki/Blood_Oath
Item Discussion #96: Blood Oath : r/bindingofisaac - Reddit
...? Isaac can avoid damage from Blood Oath with invincibility, but won't gain the damage and speed increase as a result. ? Eternal Hearts are treated as 1/2 a heart. ? If Isaac has only half a red heart, the effect will not trigger at the start of the floor, even if Isaac has soul/black hearts....
https://www.reddit.com/r/bindingofisaac/comments/q9uerg/item_discussion_96_blood_oath/
Blood Oath - The Official Binding of Isaac: Antibirth Wiki
...If the player has at least one Rotten Heart, damage from Blood Oath takes away every red heart, usually resulting in immediate death unless the player has soul hearts....
https://antibirth.fandom.com/wiki/Blood_Oath
Hearts - The Binding of Isaac Wiki
...If Isaac runs out of both Red and Soul Hearts he will die and view his Last Will, unless he has Dead Cat, Ankh or 1UP. If Isaac enters a room with a half Red Heart or less, a pool of urine (blood in Eve's case) will be formed under him. In......
https://bindingofisaac.fandom.com/wiki/Hearts
Can I die if I only have soul hearts after making two deals ... - Reddit
...I just made two deals with the Devil as Eve and when I finished, I had only half a soul heart, so what happens if I run out? Do I die?...
https://www.reddit.com/r/bindingofisaac/comments/8lslmg/can_i_die_if_i_only_have_soul_hearts_after_making/
Death - Binding of Isaac: Rebirth Wiki
...As long as Isaac has health of any type (Red, Black, Soul, Bone, Rotten, or Coin hearts) left, they will not be killed, except if Isaac only has an Eternal Heart, though this is impossible....
https://bindingofisaacrebirth.fandom.com/wiki/Death
Blood Oath - The Binding of Isaac: Repentance+
...The familiar will drain as much red hearts as possible without killing Isaac, ultimately leaving him at half a red heart, or no red hearts at all if he has other types of hearts that will keep him alive....
https://isaacguru.com/item/c569
Health - The Binding of Isaac: Rebirth Wiki
...Replacing all 12 Heart Container slots with Broken Hearts will cause Isaac to instantly die, and if revived, Isaac will have 1 of the Broken Hearts removed and have half a Soul Heart take its place....
https://bindingofisaacrebirth.wiki.gg/wiki/Health
Blood Oath - The Binding of Isaac Wiki | MinMax
...Stabs Isaac at the beginning of each floor, draining his red hearts. Increases damage and speed for the floor based on the amount drained....
https://minmax.wiki/isaac/blood-oath
Can you survive with soul hearts only? - Fandom
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You can survive Devil Room deals with sufficient hearts. The exception here is The Pact and The Mark. Picking these up and getting 0 hearts will automatically kill you, unlike other devil room items.
...https://bindingofisaac.fandom.com/f/p/1962344435417413232