The Brute is tribute. It is not used, crafted with, or consumed by anything else in the game — its only purpose is opening an arena door.
Megapithecus Arena on
The Island, The Center, Valguero, Fjordur
Dinopithecus King Arena on
Lost Island
Crystal Wyvern Queen Arena on
Crystal IslesOne artifact opens the portal once. Bring a spare if you intend to run the fight twice.
Alpha Megalodon, 
Alpha Mosasaur, 
Ammonite, Cnidaria, 
Coelacanth, 
Electrophorus, 
Ichthyosaurus, 
Manta, Megalodon, Mosasaurus, 
Sabertooth Salmon, 
Trilobite 
Anglerfish, 
Araneo, 
Arthropluera, Cnidaria, 
Dung Beetle, 
Dunkleosteus, Electrophorus, Eurypterid, 
Helicoprion, Manta, Megalodon, Mosasaurus, 
Piranha, 
Pulmonoscorpius, 
Titanoboa, Trilobite, 
Xiphactinus 
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.
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Terror Bird
Onyc
Achatina
Mantis
Desmodus
Leech