Unstable Nether Portal
The Unstable Nether Portals are found in various locations throughout the Broken Shore as long as the Nether Disruptor is active. They can be disrupted with a 
[Nether Portal Disruptor], sold by 
Warmage Kath'leen at Deliverance Point in exchange for 250 
. Doing so will summon forth one of the following demons:
- Lambent Felhunter
- Warped Voidlord
- Baleful Knight-Captain
- Ruinous Overlord
- Malformed Terror
- Ruinous Overfien
- Warped Overlord
- Warped Voidlord
- Anomalous Observer
Patch changes
Patch 7.2.0 (2017-03-28): Added.
