The Hypnos-T Type was an experimental model of Tyrant seen at Sheena Island's "Tyrant Plant". It is named after the Greek God of Sleep, and the accompanying word "Υπνος".
The Hypnos project was the brainchild of Commander Vincent Goldman, a eugenicist and fierce Umbrella supremacist. 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 strongest to keep the organism ongoing and encouraging the reproduction of the better cells. The process was repeated hundreds of thousands of times day and night for three weeks.[excerpt 1]
A neurotransmitter known as "β Hetero Nonserotonin" was also necessary for its creation.
Once awakened, it proceeded to kill either Andy Holland, UT Commander, or the commander of the Sheena Island base, Vincent Goldman, depending on the ending the player gets. Either is killed while while talking to detective Ark Thompson, before turning its attention to him. After a brief conflict in a small corridor, the creature was knocked unconscious.
Unbeknownst to Ark, the creature was still 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. Nearly defeated in a second encounter with Ark on a Helipad, the creature began to mutate again.
Hypnos-T Type fought a long, grueling battle with Thompson, but in the end it was destroyed when it leapt upon Thompson's escape helicopter, at which point a sidewinder missile was launched into its abdomen. Seconds later, another missile was launched against it, detonating both and killing it once and for all.