Plant Door

The plant door spell opens a magical portal or passageway through trees, undergrowth, thickets, or any similar growth — even growth of a magical nature. 

The plant door is open only to the druid who cast the spell, druids of a higher level, or dryads. The door even enables the druid to enter into a solid tree trunk and remain hidden there until the spell ends. If the tree is cut down or burned, the druid must leave before the tree falls or is consumed, or else he or she is killed also. The duration of the spell is 1 turn per level of experience of the druid casting it.

If the druid opts to stay within an oak, the spell lasts 9 times longer, if an ash tree it lasts 3 times as long. 

The path created by the spell is up to 4-ft wide, 8-ft high and 12-ft/level of experience of the druid long.