Concept art for Final Fantasy VIII.
The Archaeosaur (アルケオダイノス, Arukeodainosu?, lit. Archeodinos or アルケオザウルス, Arukeosaurusu?, lit. Archeosaurus), also known as the Archeosaur or T-Rexaur, is a recurring creature in the Final Fantasy series, first appearing in Final Fantasy V. It most frequently appears as a theropod dinosaur.
Appearances[]
Final Fantasy V[]
The Archeosaur appears as an undead enemy encountered in the Pyramid of Moore. It uses Claw as its critical attack. Archeosaur also relies on its two Breath attacks, Poison Breath and Zombie Breath, to damage all targets, and possibly inflict poison or zombie status randomly. Archeosaur also has the Blue Magic spell Level 3 Flare, but the player has to Control it and cast Reflect on Archeosaur to learn it. Level 5 Death restores it to full health.
Final Fantasy VIII[]
The T-Rexaur appears an enemy encountered in the Balamb Garden training center, the forests on Balamb island, and on the Island Closest to Hell. If Squall encounters one with Quistis either during the Fire Cavern mission, or during their meeting in the training center after the inauguration ball, Quistis will prompt the player to flee the battle. During the Balamb Garden Revolt T-Rexaurs appear as random encounters around the facility, and in a fixed encounter at the Training Center if the player chooses to defend the kids there from the Garden Faculty.
Final Fantasy XII[]
The Archaeosaur appears as a dragon/tyrant-type enemy encountered on the Phon Coast. It has Fumarole as a rare steal.
Final Fantasy XIV[]
The Archaeosaur appears as an enemy encountered in the Churning Mists as a regular enemy. It can also be encountered in the FATEs 
Supper Time and The Nuts.
Pictlogica Final Fantasy[]
The Archeosaur from Final Fantasy V appears as an enemy.
Final Fantasy Record Keeper[]
The Final Fantasy VIII version appears as a regular enemy, as well as a boss during select events. Both the T-Rexaur and Archaeosaur names have been used for its appearances.
Final Fantasy Brave Exvius[]
The T-Rexaur from Final Fantasy VIII appears as a boss during the "Ancient Dinosaur" event, while the Archaeosaur from Final Fantasy XII appears as a boss during the event "The Salikawood."
Mobius Final Fantasy[]
The Final Fantasy VIII T-Rexaur appeared as a wind-elemental Warrior ability card for players to summon during the Final Fantasy VIII collaboration event. It allowed player characters to perform the Jurassic Roar (ジュラシックロアー, Jurashikku Roā?) Warrior ability, which dealt wind damage to enemies within an area of effect several times.