Publication:Quest for the Heartstone
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Quest for the Heartstone is a wilderness and dungeon scenario, and includes a frost giant lair, with four pages of illustrations to show the players.
XL1: "Quest for the Heartstone" (1984), by Michael L. Gray, was the first and only adventure in the "XL" series for Expert D&D. It was published in 1984.
A New X Series. Following the Mentzer-led revisions of the Basic D&D game (1983), TSR experimented with a variety of Basic D&D lines other than the traditional B- and X-series adventures. Among them were the "AC" accessories, the "M" (magic marker) adventures, and the "O" (one-one-one) adventures. Thus, the XL series - an abbreviation for "Expert Licensed" - was just another series among many now available for the Basic D&D game.
In fact, it was probably less distant from the norm than many of the other Basic D&D series, since it offered up an expert adventure with just one minor twist...