Onslaught is the first set (and the only large expansion) in the Onslaught block. It is the 27th Magic: The Gathering expansion and was released on October 7, 2002. The prerelease was September 28–29, 2002.
Onslaught, like its following expansions in the Onslaught block, Legions and Scourge, featured a theme that focused heavily on "tribal" cards, or cards that are concerned with creature types. The set contains 350 black-bordered cards (110 rare, 110 uncommon, 110 common, and 20 basic lands). Onslaught's expansion symbol is a stylized morphed creature.