Koro'Lume is a vertical world: its surface too hostile for long-term habitation, its life concentrated in towering, sky-straddling forests. Trunks the size of skyscrapers rise from toxic lowlands, their crowns braided into a continuous canopy hundreds of metres above ground.

Verdant communities here live in woven platforms, hollowed boles, and cluster-nests grown where the living wood is thickest. Rope-vines and gliding membranes replace roads; rivers run through the branches in suspended, root-lined channels.

Koro'Lume is where the Covenant perfected long-chain symbiosis: entire lineages bound to particular tree-clusters, each clan's biology tuned to a slightly different mix of canopy pollen and leaf-chemistry.