The Void is tribute. It is not used, crafted with, or consumed by anything else in the game — its only purpose is opening an arena door.
One artifact opens the portal once. Bring a spare if you intend to run the fight twice.
No tips here yet — be the first survivor to leave one.
Leaving tips is for survivors on the rewards list — reserve your rewards with your e-mail once and the form unlocks everywhere.
0 
Coelacanth
Direwolf
Hesperornis
Kaprosuchus
Polar Bear
Polar Purlovia
Sabertooth Salmon
Sarco
Yeti