Avalon Spell Books, Vol. 1, Issue #5 (PFRPG) PDF

Tree shape, most spellcasters do not ever remember this spell exists except some extraordinary circumstances. Lacking any natural inclination towards serene photosynthesis, they use it when they need to stay motionless and unnoticed at some dangerous place for many hours, or when their companions need a “large dead tree trunk“ to get across a particularly nasty stream.

Or may be when the group wants some shade in the middle of a desert.

Rooting and vegetating still offers more interesting experiences for patient spellcasters, ready to look for new magics in arboreal life. And the first option of interest is the fact that a tree can sleep, wherever it can root, ignoring many inconveniences that would have given a bad night for a humanoid.

Resting while in tree shape. It is fully possible to sleep while being a tree, even getting a proper night's rest provided the shapechange duration is long enough. Much like a normal sleeping character, the dormant tree has reduced Perception abilities. If the spell duration ends before the character gets enough rest, the event should be treated as any other hazardous awakening in the game.

Using tree shape underwater. Contrary to popular belief, one can use tree shape underwater. In this case the spell transforms caster into a large kelp, firmly attached to the river- or seabed, instead of a common shrub. In case of any doubts, game master may require the character to succeed at a Knowledge (nature) check DC 15 to choose a proper plant type to transform into. Since kelp can “breath” water perfectly, the caster does not need any additional means of water breathing for as long as the spell duration lasts.

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