These provide backstory and are required for 100% completion achievements.
This is your most vital tool. It slows down the world while allowing you to move and aim at near-normal speeds. Use it in short bursts to clear rooms or headshot multiple enemies before they react. f-e-a-r-fear-platinum
Firefights create dust and debris that can obscure your vision. Shoot explosive barrels or fire extinguishers to damage enemies or clear their cover. Collectibles & Upgrades These provide backstory and are required for 100%