Whether they were the children of druids, unusually good with animals, or literally raised by bears, bear-bonded berserkers share a connection beyond words with their ursine companions.
At 3rd, level, you gain an ursine animal companion. You learn the Beast Friend ranger knack with the following changes:
Also at 3rd level, whenever you enter or end a rage, your bear companion does as well on its own turn. While raging, it receives the same benefits you do, with the following changes:
Your bear cannot enter a rage if it has no temporary hit points, and ends its rage if it runs out of temporary hit points.
At 6th level, your bear companion’s training has notably improved its defenses. Choose one of the following.
Your bear companion gains the benefits off the Juggernaut battle defense feature, except it is not proficient with shields. However, armor for your bear companion must be specially made or extensively altered, usually costing twice the price of armor for a humanoid of the same size and adding an additional 10% to the crafter’s fee.
Your bear companion gains the benefits of the Rugged Defense battle defense feature, including the movement bonus, except it uses your ability modifiers to calculate its Armor Class (unless its own are higher) and does not benefit from a shield you are wielding.
At 10th level, while you are both raging, when you take the Attack action you can forgo any number of attacks to instead direct your bear companion to make the same number of attacks as its action.
In addition, your bear companion grows larger and more powerful. It now treats its natural weapons as magical and uses the statistics of a brown bear. When you gain this feature, and whenever you gain a different bear companion, you may choose whether your bear companion is Medium or Large size.
At 14th level, while raging, your bear companion gains resistance to all damage types except psychic and makes all saving throws except Intelligence with advantage.