Bound Guardian
A bound guardian is a tattoo guardian bonded to your skin, which you can temporarily animate to protect you. If your soul leaves your body, your tattoo guardian might be destroyed (see the sidebar, Bestiary 3 262).
Activate ◆◆◆ command, envision, Interact (conjuration)
Frequency once per day
Effect You animate your tattoo guardian, otherwise using the duration and other parameters of a 4th-rank Summon Construct spell. You can have the guardian Fly Free as part of Activating your tattoo. If your tattoo guardian drops to 0 HP, the activation ends, and the inanimate tattoo returns to your skin.
Traits
A character can invest only 10 magical items that have the invested trait. None of the magical effects of the item apply if the character hasn't invested it, nor can it be activated, though the character still gains any normal benefits from wearing the physical item (like a hat keeping rain off their head).
Something with the magical trait is imbued with magical energies not tied to a specific tradition of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.
A tattoo is a type of item that is drawn or cut into a creature's skin and usually takes the form of images or symbols.