Marvel Ultimate Graphic Novel Collection Classic XXIII : Warlock (Part 2)

The Magus is no more — but Adam Warlock's troubles are far from over! Following a battle with a near-omnipotent being dubbed the Star-Thief, the golden-skinned hero discovers the origin of his mysterious, vampiric Soul Gem. With the truth revealed, Warlock faces his greatest test yet as he battles to keep the ancient artefact away from one who would use its power for great evil — none other than Thanos, the Mad Titan!

Collecting Warlock #12–15, Marvel Team-Up #55, Avengers Annual #7, and Marvel Two-In-One Annual #2.