Frequently called "brown-furs," these transmutation-focused arcanists are known for transforming themselves into animals. What few realize is that these specialized arcanists excel at turning themselves—and others—into all kinds of creatures.
At 3rd level, the brown-fur transmuter learns to harness the power of her magic to empower her transmutations. Whenever the brown-fur transmuter casts a transmutation spell using one of her arcanist spell slots, she can expend 1 point from her arcane reservoir as a free action to bolster the spell. If the spell grants a bonus to an ability score, the bonus then increases by 2. If it grants a bonus to more than one ability score, only one of the ability scores gains this bonus. The brown-fur transmuter cannot expend more than 1 point from her arcane reservoir in this way. This ability replaces the arcanist exploit gained at 3rd level.
At 20th level, the brown-fur transmuter learns to fully master the power of transmutation. Whenever she casts a transmutation spell, it is treated as it were affected by the Extend Spell feat without altering the casting time or slot used. (She cannot then alter its duration again with the Extend Spell feat.) Whenever she uses her powerful change ability, the bonus increases by 4 instead of 2. Her share transmutation ability can now target a willing creature within 30 feet. This ability replaces magical supremacy.