Kaldir was a frozen planet that served as a protoss colony world prior to and somewhat during the Second Great War. Daelaam expeditionary forces attempted to alter the climate by reversing the planet's rotation.

When Kerrigan arrived to pick up Nafash's brood, the protoss had killed Nafash by that time and left her brood to freeze. Upon detecting Kerrigan's presence, the expedition leader threatened to contact the Golden Armada. Before they could do so, the Swarm managed to destroy the psi-link spires and the ark shuttles. The remaining protoss escaped on a large shuttle on the far side of the planet, but Kerrigan managed to send broodmother Niadra to the ship via Lasarra. The protoss colony was ultimately destroyed, the expeditionary force completely killed, and Kaldir belonged to the zerg.