Allows a Ranger whom has selected the Beast Master Archetype and the Improved Beast Mastery increased ability to train beasts. With this feat the ranger companion options are expanded to include all beasts up to Large size and 2 CR.
Its hit point maximum equals the hit point number in its stat block or now five times your ranger level, whichever is higher, which was previously four times your ranger level. 

Intended for levels 7 - 10.