Planes are now more powerful. Elemental planes will resist attempts to
change a room's nature. So if you cannot meld with the plane's default
nature then you cannot meld on that plane. (IE-Geomancers only can meld
in Plane of Earth and ditto Aquamancers on Plane of Water.) Also, taking
a cosmic companion to a rival cosmic plane will cause them to explode
due to the foreign nature of the area. So demons in Celestia and angels
in Nil will not last very long.

Penned by my hand on the 22nd of Kiani, in the year 102 CE.