Worldship

Worldships were "mighty" Xel'Naga ships.

Worldships were capable of landing on planets, as well as remaining above planets when the Xel'Naga didn't want the inhabitants to notice them. At least one Worldship was attacked by the Protoss as it took off; the Protoss fell to their deaths.

Xel'Naga ships were protected by reinforced hulls. This failed to protect the Xel'Naga fleet against the attack by the Zerg.