Recieved this Apexis Crystal repeatable quest from my Garrison.
Upon activating the Void Portal in the Enclave, a huge bar showed up stretched vertically in the center of my screen with an energy level that determined how long I'd be in the twisting nether.
Also I killed 10 void creatures in the twisting nether and acquired Power Overwhelming, which transformed me into a Void Terror. While in the Void Terror vehicle, it uses action bar buttons 4-6, kinda odd placement there. You're also incapable of looting through it.
After the transformation vehicle timed out I looted a Void Terror I'd previously killed and the server crashed in that instant. Not sure if that's coincidental.
The void portal did not return after completing the quest, so I cannot screenshot or re-test the interactions.