How long disappear teleports summons of Gaz'Haragoth? What's happens when we go this teleport?

Question

Today, while beating Gaz'Haragoth I was thinking how much time passes before the blue teleporters disappear? what happens when we get in?

Answer 1

This vortex appears when a Minion of Gaz'haragoth dies, its corpse turns into a vortex which leads to an area with Nightmares of Gaz'haragoth.  Inside you will be able to face   Nightmare of Gaz'haragoth which looks like a Terrorsleep. They are not that strong, people mostly are killing them. Abilities - Melee (0-300+), Distance Attack does Life Drain damage (500-800), Some kind of beam (500-1000)

Strage Vortex  closing after 1-1.5 minute.

It's also possible to spawn Minions up on the stairs when  is trapped next to the stairs. So strange vortex can also appear up on the stairs if people kill minions there. It's just a funny fact :)

Comments

I read this from wikia: Strategy:
Ignore them and run to the portal in the south-east. These creatures have instant respawn, after you killed them, they spawn again in a moment, so they should be avoided at any cost.

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Well, I made this answer about my own experience :D

Answer 2

I'm not sure about the certain time of the  Strange Vortex disappear, but from my reminds I believe it takes like 1 - 2 min, they are not are actives for so long.

But what I'm sure is that when you pass over them they will teleport you into another area with around 10  Nightmare of Gaz'haragoth.

The best you can do is run to the south into another teleport to go back to stairs because thoses creatures have instanr respawn, after you killed them, they spawn again in a moment.