The Hypnos-T Type was an experimental model of Tyrant seen at Sheena Island's "Tyrant Plant". The main variation between this Tyrant and other models was the inclusion in its genetic make-up of the Hypnos gene, a modified genetic strand that, when implanted into an organism, would kill the weaker cells through natural selection, leaving only the best to keep the organism ongoing and encouraging the reproduction of the better cells. A neurotransmitter known as "β Hetero Nonserotonin" was also necessary for its creation.In its original form, Hypnos-T Type resembled a genderless and hairless youth.Its only attack in this form was using its sharp clawed arm to stab its prey.Unbeknownst to Ark, the creature was alive and continuing to mutate. These mutations granted it greater muscle mass, much larger claws on its left hand, an enlarged jaw, and sharp teeth.
In this state, the Tyrant could run at high speeds and viciously slash its opponents. It could also perform a downward strike. Its most dangerous attack was a powerful jumping strike performed at a distance. Lastly, it could strike with a swift lunging strike.The creature lost much of its intelligence in the process, suffering through a form of hypertonia, and losing its humanoid shape, becoming a bestial, primate-like, hunched monster. Because of the excessive muscle growth, the Tyrant was rendered vulnerable, with the heart becoming exposed as is common in its brethren. These new weaknesses didn't make it any less agile, however. It compensated for the exposed heart by shielding it with its claws.