Arachnophobia

After barely surviving an encounter with a spider, you gain the following drawbacks:

Fear of Spiders. Whenever you encounter a Small or bigger spider, you must succeed on a Wisdom saving throw (DC 13) or become frightened of the spider until it is reduced to 0 hit points. You can repeat the saving throw at the end of each of your turns, ending the effect on yourself on a success. If there are multiple spiders, you must succeed on a save for each one, or the DM might call for a Sanity saving throw instead.