The Astral Archive #293

The Gate into the Innerspace: "After the Great Tree was created, the Resolute Empress herself cut its planar veil, creating a gate that allowed her people to retreat through it. Much like the doorways between other realms, the gate remained stable, and though Innerterrestrial wielders of the Art tried closing it, they couldn't. Only beings without flesh can pass through the gate, so it remains secure from the Watchers. Very rarely, visitors come through, gazing at the beauty of the Innerspace or trading prized intelligence of other realms for arcane secrets. After all, the tear between worlds still remains open on Zanay'San in a way, though well-hidden."