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Companion's Bond is a Beast Master Ranger passive feature that enhances your companion.
Description
Your 
receive a bonus to 
Armour Class and damage equal to its[See Notes] 
Proficiency Bonus.
How to learn
Classes:
- Class level 5: Beast Master
Used by creatures: Funglesby, Aranea Major, Aranea Aculeata, Corvus Major, Corvus Celer, Lupus Major, Lupus Optumus, Ursa Major, Ursa Ingens, Verres Major, and Verres Calamitosus
Notes
- The in-game description says that the bonus scales with "your" (i.e. the Beast Master's) proficiency bonus, but in fact it uses the animal companion's proficiency bonus. This means the bonus will not increase to +4 until the final level 11 upgrade to your animal companion rather than at character level 9.
- If a beast companion is already active when the Ranger levels up to level 5, it receives this feature's upgrades and appearance change immediately. The Ranger does not need to re-summon it.
- Prior to the level 5 upgrade, animal companions will incorrectly have a proficiency bonus of 0 instead of +2. After the level 5 upgrade, the proficiency bonus will correctly increase to +3. Effectively, this means that at level 5, your animal companions will also receive an increase to their attack rolls equal to your proficiency bonus, but this is not actually part of this feature, merely a consequence of bugged proficiency bonus progression.