World of Warcraft : Classic

The Wailing Caverns are a network of underground caverns within the heart of the Barrens. Its waterways carry underground rivers for miles beneath the savannah, and naturally bubbles to the surface as small oases throughout the Barrens. The caverns were discovered by the night elf druid Naralex, who named them after the mournful howls produced by the wind traveling through the caverns. Naralex believed that if he connected the underground waters directly to the Emerald Dream, he could spread growth across the Barrens and restore the region to its original lush state. He traveled into the caverns with his loyal disciples and settled into meditation, allowing the Dream to connect to Azeroth through his body. But, he was unexpectedly overwhelmed by the Emerald Nightmare. Unable to wake, the sleeping Naralex inadvertently channeled the Nightmare's energies into the caverns, corrupting the waters, the wildlife and his disciples, most of whom went insane and became the Druids of the Fang.