All rangers form a strong spiritual connection with a single creature, their Animal Companion. This connection allows rangers and their companions to coordinate attacks and efficiently take down prey. In most situations, the companion runs interference while the ranger attacks at range.
Despite these advantages, there are risks to the relationship. Rangers share a literal life bond with their animal companions. When one is wounded, the other suffers equally. This also means that when one falls unconscious and dies, so does the other.