You can shove your staff in fertile earth to transform it into a healthy tree. The tree is up to 6 squares tall and has up to a 6 square diameter trunk. The tree appears decorated and shaped inside however you want it to and you can enter inside it.

Solid Fog. You can fill up to a 2 square radius around the tree with thick fog, making the area heavily obscured. The fog reaches 2 squares high. In addition, every foot of movement through the fog costs 2 extra feet. To a creature immune to this effect, the fog obscures nothing and looks like soft mist, with motes of green light floating in the air.