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Full: For 120...264...300 seconds, your animal companion gains 1...3...3 Health regeneration, and half of all damage dealt to your animal companion is redirected to you.
Concise: (120...264...300 seconds.) Your pet has +1...3...3 Health regeneration. Half of all damage dealt to your pet is redirected to you.
This redirection happens after AL from the pet, but before reduction by Call of Protection, which means the more armor the Pet has, the less damage is transferred to you as a result, but will ignore the effects of Call of Protection entirely.
Combine with casting Balthazar's Spirit on yourself to gain Energy whenever your pet takes damage. This will also stack with Life Bond cast on your pet, resulting in gaining 2 energy whenever your pet takes damage.
Beware - since it is a shout, you cannot end it prematurely if you are taking too much damage.
Another trait of Symbiotic Bond to be weary of is that when struck by an Area of Effect ability or a Scythe, you will take both the normal damage from the ability/scythe, and take follow-up damage transferred to you from your pet, essentially receiving damage from the same ability (or Scythes) twice.