Constriction

The constriction is a type of zerg building.

In 2506, when Reclamation of Aiur failed after Amon corrupted the Khala, Hierarch Artanis led Phase-Smith Karax and a group of freed Khalai protoss to Khor-shakal in order to escape aboard the arkship Spear of Adun. However, all but one of the power cells were rendered inoperable by zerg constriction. Despite resistance from Amon's zerg forces, hybrids, and corrupted Khalai, Artanis and his survivors destroyed the constriction and escaped Aiur.

Additional constrictions were found within the Nerazim capital of Talematros, rendering the dark templar launch bays inoperable. Once again, Artanis's forces destroyed them, rescuing the Nerazim people.