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So I recently came across, what i assume is a rare boss spawn:

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I noticed with this one, that his color changed from white, to orangeish. His speed increased a lot, and made it hard to dodge. And instead of what the normal boss spawns, he spawned the maggots that shoot.

So my questions are:

  • What are the chances of getting a rare boss?
  • Does it drop, or unlock anything special, that the normal boss doesn't?
  • Are there any other differences than the ones i listed? (Faster, higher damage, other spawns)
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I doubt anyone can actually give you a completely accurate answer without doing something along the lines of disassembling the game or being Edward McMillan, but after a rather successful run I think I can shed some light on this.

Chances of getting rare bosses: Boss enemies can be encountered not only on actual boss rooms, but also in seemingly ordinary room (this is especially common in The Womb). To me, it seemed that the frequency of special bosses is on par with the frequency of other special enemies, which in turn depends on the level you are on, as harder levels contain more rare enemies. When travelling in the womb, I'd have to say that 1 in four bosses I came across were rare, and less so on the easier level.

Do rare bosses drop anything special: Assuming an empirical answer can be provided for this, then after dispatching of at least 10 rare bosses, 3 of which in an actual boss room, I would have to say that the answer to this is no.

There is also the matter of Alt-Bosses, which are not a rare boss strictly speaking (they are more of a re-skin than a pallet change). These do drop specific special items as can be seen here and here.

Are there other differences to rare bosses: There are at least three that I am aware of, though I suspect there are many, many more. Here are a few examples from my latest run:

Green Chub

This green colored Chub was actually slower than the regular Chub, and spawned boils instead of maggots. Be aware that the color doesn't necessarily indicate the rare boss's properties, as this page lists the version I described as black, and the version you described as green.

Darkish Monstro

I encountered this darker version of Monstro, which was slightly bigger than a regular Monstro. I can't say I noticed any additional differences. I also had a chance to encounter Monstros that are smaller than usual.

Lime Larry Jr.

This green/lime version of Larry Jr. actually fires projectiles at random, much like the Gusher enemy (and also makes a green mess of the floor).

Like I said, I suspect there are even more variations (some of which are chronicled in this wiki), but these are the ones I came across.

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