You can use transformation magic to modify a target creature or part of a creature.  You must make a successful Scrivening check to correctly shapeshift the target.   All transformations take 1 round to complete and unwilling targets get to make a Resist check to avoid the change taking place.

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If you want to change the size of a target then you must first use Scale to modify the spell to work on a target of that size.  Then you add +2 Spirit for each difference in size rank between what it is and what you want it to be.  This can be done by itself, or as part of transforming the target into a different creature.

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Partial shapeshifting allows you to either change a limb, organ, or feature (such as growing tiger claws) or grow new features on the target (such as adding a tail or wings). To spend 1 Spirit for each of the new additions (note that paired features such as wings count as 2 features).

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Transformed creatures do not gain all the traits and abilities of their new form unless you put Spirit into the Intensity modifier to include such aspects.  The amount you spend determines the number of traits and abilities you give to the transformed target.  This is provided that you are familiar enough with the new form to transform everything correctly.

This spell costs 4 Spirit to cast when shapeshifting the entire target, 2 Spirit when adding new limbs or features, and 1 Spirit for partial transformations.