While an announced raid occur, there's extra chance to a non-raid boss to appear?

Question

Let's suppose venore elfs raid occur (which occur out of their spawn), this raid has no tied boss known so far, so there's any chance to the elf scouts/elf arcanist boss appear in it? if so, this chance is increased due is a raid or simply the boss got in it due lucky RNG? otherwise, if a non-raid/unannounced raid boss appear during an announced raid has absolutely nothing tied to the raid?

it were nice to know since many announced raid have not a tied boss in it, so unless player were looking for raid tokens those raid bring almost no other known benefit

Answer 1

Short answer: no.

Long answer:

The best knowledge we have about the inner workings of the raid system today is based on leaked files from several years ago. However, it has probably not changed much since then. From that info, we know raids have specific spawn points with ranges, and that each monster/boss can spawn in certain pre-defined amounts. A message announcing the raid is totally optional.

Consider this example (not real data)

Creature: Dharalion
Amount: [1,1]
Spawn Point: (33038,32177,9)
Range: 2
Message: <blank>

Creature: Elf Arcanist
Amount: [1,3]
Spawn Point: (33038,32177,9)
Range: 5
Message: <blank>

This means that when this raid is picked by the server, it will spawn Dharalion no more than 2 tiles away from that coordinate, and either 1, 2 or 3 Elf Arcanist somewhere 5 tiles around there. It will not send any messages (so it is an unannounced raid).

With these parameters, we can describe pretty much all raids (announced or not). A "surprise" boss would have to be described with its amount as [0,1], meaning 0 or 1 of them can be created with a raid. And given how old certain announced raids are, we can be quite sure that no unexpected bosses are coming out of them - we have collectively killed them too many times and we would have seen it by now.

But what if the spawn chances are very low when we have [0,1]? Well, we had recent confirmation from CIP that some bosses do indeed have a chance of not spawning with their raids (while some of its minions still show up) - however, we also see these bosses showing up just as often, so it seems like the chance is just 50/50.

Comments

Thank you ver much for posting this official reply. Voice of Ruin are one of the Zao bosses that we thought as "bugged". Good to see an official reply showing that this is intended (making them even more rarer on purpose).

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Yep, but I don't think bosses that have this behavior are necessarily rarer. The [0,1] parameter is probably compensated by the fact that this boss is part of at least 2 different raids/spots. So on average we still see the same amount of Voice of Ruin with 2 raids of [0,1] vs. 1 raid of [1,1]. This mechanism is quite clear in most of Zao bosses.

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Thank you, and thanks for adding official source proofs, so basically we have proofs and in-game patterns that show bosses as instances of an event which must be programmed and the rng part only play a role in which instance would occur, makes sense and i hope a better way to rephrase it without resorting to leaked files could occur, yet is even completely logical and understandable even without knowing that extra info so this answer suffice my question, ty again.