That's weird . I wonder why it's black on the map .

^ Thanks Calysis. I'm like 99% sure that I killed all enemies there and never spotted Serrin & Blighttooth. I might be wrong though. Will check it out again today.

Thanks everyone for trying to help, but alas, with extensive further testing I'm 100% positive that:

- No other bosses except Diabolist Vethisa spawn - ever!
- Cannot be completed. (*)

* possibly because other 2 bosses don't show.

Hopefully Beth/Zeni will do something to fix it.

If this is the delve I think, be prepared for a long spell circling. Only one boss spawns at a time. Which boss is random. You have to kill whichever boss spawns before another boss spawns. This may require killing a boss multiple times before the one you need finally spawns. One boss spawns in a corner by cages. The next spawns in the skyshard area. The last spawns in the opposite corner from the first boss. All you can do is keep circling, kill bosses as they spawn, and hope to get lucky. RNG can be tough .

maboleth wrote: »

Thanks for the tip, but that didn't work when I waited few months ago. I think I made 3 full circles. Only Diabolist Vethisa spawned for me consistently.

Even if that worked, it's not normal. All bosses should be there. None should repeat killing the same boss in the hope of others appearing.

It may not be fun, but it IS normal, at least in the sense that that is the boss spawn mechanic for that delve. 3 circuits. is not enough. You might need to do a hundred or more. It sucks, but that's what it takes to complete the delve.

edit: just so you know, I've completed this delve on multiple alts.

maboleth wrote: »

A few hundred or more? Are you kidding me? I really wonder what ZOS have to say about this, really. I've been in many delves and dungeons, but never ever saw these kind of "mechanics".

It doesn't make any common sense. If there are three bosses, all three should be there. Period. It's totally not logical to keep killing the same boss, running in circles and hope for others to "arrive"!

I trust you completed this in the current state, but this delve has issues. And in my view, it's a bug, a major one that is.

This is by design and has been that way since launch. They do it to prevent "camping" bosses. You need to keep moving and cannot stay in one place all the time. It would be nice if bosses were on a rotation and killing boss X made boss Y spawn and killing boss Y made boss Z spawn. But killing boss X might just make boss X respawn in a couple minutes. You never know. It is random. Everyone seems to have that one Cyrodiil delve where they just can't seem to get the bosses they need to spawn. I remembering taking all night to clear one delve and my friend cleared it in like 10 minutes. And there were delves I cleared with ease that took him running in circles forever.

bosses in cyrodiil delves do spawn, its just really slow. I've had to spend several hours in pothole before to get the boss I needed to appear.
BTW several delves have multiple bosses there.