You are acquainted with (and well-versed in) fear. Under certain circumstances, you strike terror into the hearts of your enemies. Under other circumstances, terror is quite easily struck into yours.
Terrifying. You gain expertise in the Intimidation skill.
Loud Noises. Loud noises make you jump. When you hear a loud noise, you must succeed on a Constitution saving throw or drop anything you are holding. The DC is 10 for a loud noise, 15 for an extremely loud noise. The DM decides.
Darkness. You are afraid of being alone in the dark. When you're in an area of darkness, magical or mundane, and no ally is within 30 feet of you, you must succeed on a Wisdom saving throw at the beginning of each of your turns, or become frightened of the dark. The DC equals 20 - your proficiency bonus - your highest ability modifier. You must attempt to either move out of the darkness or towards an ally. Being in dim or bright light, or being within 30 feet of an ally ends the frightened condition immediately.
Big Monsters. You are scared of hostile monsters much bigger than you. When you are within 30 feet of any hostile creature at least 2 sizes larger than you (a "Big Monster"), you must succeed on the same Wisdom saving throw as the save you make in darkness (DC 20 - PB - your highest ability modifier) or become frightened of the creature until the beginning of your next turn. You must re-roll the save when you begin your turn within 30 feet of the creature. If the creature ever becomes less than 2 sizes larger than you, the frightened condition ends immediately. As there is no upper limit to Gargantuan Creatures, the DM decides if a creature is so massive that it still triggers this Wisdom save even if it is not mechanically 2 sizes larger. Roll a save for each "Big Monster" within 30 feet of you.
If both the "Darkness" and "Big Monsters" conditions are met at the same time, you roll a single saving throw with disadvantage, becoming frightened of both the creature and the darkness. If you are within 30 feet of multiple "Big Monsters" and meet the conditions for "Darkness," make the save for each of the creatures, all at disadvantage, becoming frightened of the dark and of each creature individually on a failure.
Catatonic. If, at any point, you roll a natural 1 on any of the Wisdom saves in this feat, you immediately enter a catatonic state of shock. You are effectively unconscious for 1 hour. You are unresponsive for the duration. You can only be roused early from this state if you are put to sleep magically and then woken after at least 1 minute, or if you receive any lightning damage.