This thread is dedicated to the hidden abilities of the Halloween items “while terrified”
Ghast Call grenade = Spawns twice the amount of additional Skulls
Fearmonger shotgun = +1 Pellet for each stack of Terror.
Scream of Terror shield = Enemies & Bosses damaged by the Nova become confused and attack their allies. Confusion lasts up to 8 seconds. The more terrified you are the longer the confusion lasts.
Stalker sniper rifle = Stack of Terror add additional bullets per shot. +2 Bullets max