This fourth generation procreates in the conventional manner, and can result in either a Hybrid, a normal member of the host species or a Purestrain Genestealer, the only manner in which Purestrains can be produced. By the fourth generation, the offspring is barely detectable as alien save for a few give-away signs such as unnaturally sharp teeth and a purplish tinge to the skin.

This cycle continues, with each new generation of Hybrid resembling the host species more closely. The Hybrid passes on its genetic profile in a similar manner to its Purestrain parent. The offspring of any victim is born as a Hybrid, a corrupt creature exhibiting characteristics of both Genestealer and host species. The victim gains some of the Genestealer's remarkable strength, resilience and longevity, becoming healthier than he was before. This cell behaves like a cancer, altering the host's genetic profile. While the host is thus hypnotized, the Genestealer deposits an egg-like cell that contains the Genestealer's genetic profile. Upon encountering a suitable host, such as a human being, a Genestealer fixes its eyes upon it, mesmerizing it. Genestealers are incapable of reproducing amongst themselves, and must rely on other races to expand their population. A genestealer knows no fear, charging into combat irrespective of any threat to its life. They are huge armored six-limbed beasts, preternaturally swift and unbelievably ferocious in combat. They are protected by suits that make them all but impervious to conventional weaponry, and armed with the most devastating weaponry available.ДЄmong the most insidious of mankind's enemies are Genestealers, a strange and terrifying alien race. Terminators are the Chapter's ultimate warriors. Among the thousand warriors that compose a Space Marine Chapter, only the hundred most valorous and gifted brothers are deemed worthy enough of this honour. He finds himself assigned to the Terminator company. The player is one such Space Marine, belonging to one of the oldest and most honourable Chapters known as the Blood Angels, whose battle honours date back as long as the Imperium has existed. The defenders of the Imperium are the Adeptus Astartes, or Space Marines, bio-genetically engineered warriors of superhuman prowess, ever vigilant to destroy the many threats that face mankind across the cosmos. Under the auspices of the Emperor a psychic so powerful he is essentially immortal, a pan-galactic Imperium has been established in which mankind has spread and prospered. For 20,000 years mankind has expanded forth throughout the galaxy aided by a phenomenal invention known as the Warp Drive, which allows huge spatial distances to be traversed in a matter of hours.

Vengeance of the blood angels