Beyond Scarab of Resurgence not always working

The Beyond Scarab of Resurgence does not always spawn all 3 bosses. I have run into instances where it either spawns 2 or even 1 only.

also seeing this behaviour. anecdotally the 1-2 boss spawn happens more frequently on tight layout maps

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DrPangloss#2359 wrote:

also seeing this behaviour. anecdotally the 1-2 boss spawn happens more frequently on tight layout maps

I found the same thing; tight layouts like Haunted Mansion hallways, or even if there are terrain obstructions (like trees)

Same issue

From my own observations on Abomination (also tight corridors), it is also related to where the boss physically spawns and if there is enough room for the other bosses. Sometimes they can spawn half a screen over, so there should still be enough room to generate them all in other directions, but if they get too close to a wall then it tries to spawn the extras out of bounds or something and you get 1 or 2 less boss spawns.

Here's the kicker, it is possible to re-proc a boss spawn within the same map (assuming you can generate the portal conditions and RNG). I don't follow the intricate details, but if you initially spawn 1-2 bosses, then the next boss proc can spawn 1-3 bosses since it didn't fulfill the full conditions. Meaning I have fought some maps with 4-5 bosses instead of the expected 3.