Seriously this is bugged. Bin trying to farm Fel’s in Aszhara for couple of days - found 1 only. I get other ppl are farming. But spawn rate, wait time for imp (even with mob kills) and low drop rate on dagger - in a seasonal short lived server… Come on. If the aim is to have fun, atleast make it obtainable - also for casual players! This is broken in a bad way. It’s a long time since the excitement from phase 1 has gone, better turn it around, or you’ll loose momentum for last phase tbh.
It might depend on the server, but on my server I just send a message in local chat and other warlocks invite me, then we tell eachother where the portals are and send imps on a pull timer this way at times is 5-10 of us warlocks sending the imps at the same time. So far only got few blues out of the portals that are worthless just like the green items since the Emerald Warden replaces them all.
Its possibile to cut the time down to 1 portal pet 10-12min if you do it in group with other warlocks and while killing mobs.
That being sad I also dont like the design how it works.