Donning Trollflesh is a 12th-level ritual.[Dr385:28] When you complete the ritual, the trollskin armor worn by you or an ally grows over its wearer to perfectly disguise the wearer as a troll. The wearer still benefits from its weapons, armor, and other magic items. Creatures that interact with the affected creature can make an Insight check against your Arcana check to perceive the deception only if the affected creature does something blatantly wrong, such as being unable to speak Giant or failing to regenerate.