Angel room without Key piece

[The Unmobable spés]

Yesterday i wanted to do mega Satan with maggy and on The first floor i got a sacrifice room and managed to get The First piece of The key.
Two floors later i found another sacrifice room and tried to generate an angel again. I had that trinket which generates half a heart Most of the time when you pick up a coin, that red Penny.

And rune sack so i could also double The amount of half hearts in The room.

I went back and for on the floor to sacrifice hearts and pick up additional ones AFTER killing the local boss of The floor. I didn't had a Deal after that Fight.

Second angel appeared and i killed it The legit way but it didn't Spawn The second piece of The Key...?

Hard Mode, no mods, no seed. Is there a Chance to Not spawn a Key piece inside of a sacrifice room ?

I've already seen item rooms without items i suppose.

[beautheschmo]

Alright, so how the angels work is this:

There are 2 different angel bosses; Uriel and Gabriel, who are color coded blue and red, respectively. Uriel always drops Key Piece 1, Gabriel always drops Key Piece 2. Now, when you encounter them in angel rooms, it spawns one of them at random and if you have one of the Key Pieces, it will spawn the angel correlating to whichever one you don't have.

However, this is not the case with sacrifice rooms. In those, the first angel that spawns will always be Uriel, which occurs after you use the spikes 9 times. You have to use it two more times, for a total of 11 uses, to make Gabriel spawn, who will drop the other half of the key.

In short, you need to hit the spikes 11 times on a single floor to fight both angels.

[The Unmobable spés]

Dann man thank you :)