Lineage of the OwlBear

Coming from the Ursid Fowl you are able to take on the form of your ancestors, The OwlBear. This great power surges from within you as your animalistic nature takes over in an attempt to preserve yourself. Until 18th level, This feat is not an "at will" feat, this will automatically trigger once certain conditions are met:  

Conditions:

• Must be at 25% of max hit points or lower (temp hp not included)
• Must be Raging.

Effects:

• Gain advantage to all attack rolls, but disadvantage to all other checks and saves.
• Take half damage to all damage. 
• Once you are no longer raging you immediately fall prone from your muscles tensing up and gain 5 points of Exhaustion. This will be reduced by one point after every level gained after the 13th level as you being to master the transformation.