How does the Otherworld (with weaker version of monsters) work?

Question

Among the rewards after completing Heart Of Destruction Quest we get an item called Spying Eye.

01:24 You see a spying eye.
It weighs 4.00 oz.

It shows which portals are open at the moment. As I remember in case of stronger monsters, their portal changes each 2^nd hour counting from server safe into one random portal (Zao, Svargrond, Darama).

But how does the Otherworld works in case of weak - instable and stabilizing monsters?

Sometimes I can see both portals opened, sometimes none.

Comments

Good question. I wonder if we can trigger the vortexes somehow, to make them spawn.

Answer 1

I believe the portals in Edron and at Dwarf Bridge have a chance to open every 2nd hour (at the same time as the other portals). There are no restrictions around these though and they can either both be open, both be closed, or have only one open.