This article contains lore taken from Warcraft III: Reign of Chaos, Warcraft III: The Frozen Throne, the manuals, and/or official bonus maps.
Teleports a target unit to your highest level town hall, stunning the unit and regenerating 15 hit points per second. Lasts until the unit is fully healed.
Source
These can be bought from Arcane Vaults in Frozen Throne.