Goblin Land Mines


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Places a hidden land mine at a target point. Enemy units that move near the land mine will activate the mine, destroying the mine and causing area of effect damage to nearby units.

Source
Arthas finds four of these in Under the Burning Sky, chapter 8 of the Warcraft III undead campaign, Path of the Damned.

Tyrande can find two of these in Brothers in Blood, chapter 5 of the night elf campaign, Eternity's End.

Tyrande and Furion can find one, and buy these from a Goblin Merchant in Twilight of the Gods, chapter 7 of the that campaign.

Kael, Lady Vashj and Illidan can find two in Gates of the Abyss, chapter 5 of the Frozen Throne alliance campaign, Curse of the Blood Elves.