WizKids brings Tomb of Horrors to D&D Onslaught with new expansion

WizKids put Dungeons & Dragons Onslaught back on the radar with Tomb of Horrors - Maps & Monsters Expansion, a $49.99 add-on set for June 10, 2026. The box leans hard on one of the hobby’s most recognizable dungeon names, but its real pitch is narrower and more practical: this is a solo or co-op expansion built for people who already own either the D&D Onslaught Core Set or the Tendrils of the Lichen Lich Starter Set.

That existing-player focus matters because Tomb of Horrors still carries the kind of pull that can move a shelf. The adventure was originally written by Gary Gygax, first used for the 1975 Origins convention, and later published in 1978 as the S1 module. WizKids is trading directly on that reputation, then translating it into a modular skirmish game where the map layout and dangers are randomly generated each time. The result is a different kind of Tomb of Horrors, one designed less for memorized traps and more for repeat table use.

WizKids says players will fight through traps and monsters before facing the demilich at the center of the dungeon. The expansion adds new cooperative gameplay, map tiles, monsters, cards and scenarios, while also letting players use characters and treasure cards from previous Onslaught expansions. That kind of cross-compatibility gives the line more staying power than a one-off licensed box, especially for groups that have already invested in the system and want another reason to keep their parties in circulation.

The physical value proposition is also doing some work here. WizKids says the included monster tokens can be upgraded with miniatures from its D&D miniature lines, which gives collectors another layer of use beyond the cardboard in the box. The company also tied the June slate to a Dungeons & Dragons Onslaught custom character kit, signaling that Tomb of Horrors was part of a broader push rather than a lone nostalgia play.

For players weighing the buy, that is the real test. Tomb of Horrors gives the expansion a name every veteran recognizes, but the box has to earn its place with randomised runs, co-op play, and support for the existing Onslaught ecosystem. If that hook lands, it is the kind of add-on that can survive beyond its own encounter deck and still make it to the table.