An Animal companion or 'Pet' is a creature that fights alongside a Ranger (primary or secondary) who has captured a charmable animal via the skill Charm Animal. Pets have simple AI that allows them to attack alongside their owners, as well as use Pet Attack skills. In many cases a pet acts very much like a necromancer's minions, with the exception that they are not burdened with inherent health degeneration and have a wide range of skills (you also don't need a corpse to create them). The damage pets do and the efficiency of their attack skills is linked to the Ranger attribute Beast Mastery as well as the level of the pet.
Although pets have various appearances, pets (other than the Black Bear) of the same level are all functionally identical, with the exception of damage types. The Black Bear also possesses the skill Brutal Mauling, and the slow activation of this skill reduces its rate of attack. Pets have a maximum level of 20.
Pets also grow larger as they gain levels and evolve. Pets don't grow if they don't evolve. An unevolved pet will stay as small as it was when it was charmed. Pets that evolve will only change size once you enter a new zone.
Evolution effects
Evolution Health Damage
Dire -60 +15%
Aggressive -30 +5%
Unevolved base base
Elder base base
Playful +30 -5%
Hearty +60 -15%
Evolution chart
Level 3-10 →
Evolution-Dammage ratio
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None/ high damage dealt to damage received ratio
low damage dealt to damage received ratio
no damage dealt or received
Level 11-14 → Level 15+
Evolution-Dammage ratio
~~~~~~~~~~~~~~~~
Aggressive-high damage dealt to damage received ratio → Dire
Aggressive-low damage dealt to damage received ratio1 → Elder
Playful-high damage dealt to damage received ratio1 → Elder
Playful-low damage dealt to damage received ratio → Hearty
None2 no damage dealt or received → None
low to high damage dealt to damage received ratio → Hearty
Damage with 12 Beast Mastery and level 20 Animal Companions
Evolution Hearty Elder Dire
Damage range 15-35 17-41 20-46
Estimated non-critical damage range 15-25 17-29 20-32
Observed non-critical damage range 15-? 17-29 20-?
Estimated critical damage range 21-35 24-41 28-46
Observed critical damage range ?-35 ?-41 26-46
Average (mean) damage1 21.1 24.4 28.1
Piercing dammage pet:
Black Widow
Crocodile
Dune Lizard
Flamingo
Phoenix
Rainbow Phoenix
Slashing:
Bear / Black Bear
Crab / Reef Lurker (blue and red)
Lion / Lioness
Lynx
Melandru's Stalker
Moa Bird / Strider
Warthog
Wolf / Snow Wolf
Unknown what type of dammage they deal:
Albino Rat
Black Moa
Black Wolf
Crane
Hyena
Iguana
Jahai Rat
Jingle Bear
Mountain Eagle
Polar Bear
Raven
Tiger
White Crab
White Moa
White Tiger
White Wolf