Where can I find bosses from The Void - Burster and Dreadful Disruptor?

Question

I heard that among weaker versions of Sparks (instable and stabilizing) we can find two bosses - Burster in The Void near Kazordoon and Dreadful Disruptor  in The Void Underground north from Edron.

1. Where exactly is their spawn place?
2. Is the only one place or they can appear  among the whole respawn place?

Answer 1

Yes, these bosses sometimes appear on the portal. Burster appears here :

 

Dreadful Disruptor appears as in the picture below. Unfortunately, I found a photo in low quality.

I also asked friends who made bestiary in this place, several met Buster in the same place, so I suspect they appear in one place. I will check how I will do the bestiary, if something changes I edit my answer. I hope I helped.

Comments

Thanks a lot! I have found better screenshots and slightly edited your answer. I think nothing more to add :D