[All Patrons]New Phyrexia - SeedCore 32x56 (Patreon)

According to Phyrexian Field Reports there initially existed three spheres in Mirrodin: the surface, the interior, and the furnaces. The Phyrexians worked to add further spheres in an attempt to recreate the original nine-sphered Phyrexia

The Seedcore, the innermost layer, is a place that serves as an incubation chamber for New Phyrexia's Invasion Tree, Realmbreaker. What once served as both Memnarch's observation deck Panopticon and Karn's throne room and prison while he was the Father of Machines, 

Realmbreaker's branches grew and have created Omenpaths, connecting New Phyrexia to other planes. It contains a replica of Norn's throne made of woven roots. The air hums with a chorus of dissonant Phyrexian voices. The air shimmers with static that tastes of aether, pierced by shafts of buttery, golden light. A hole in the floor leads to a ten-foot drop onto a hovering porcelain disk just above an even larger hole that leads to Realmbreaker's roots.