Instructions
Use a Detect Life spell or enchanted item when you travel near or in caves. Will-o-the-Wisps tend to stay invisible until they attack you. Detect Life lets you see them even if they are invisible. You can also see Will-o-the-Wisps when they float over water.
Run away from a Will-o-the-Wisp if one confronts you. The Will-o-the-Wisp only damages you if it touches you.
Cast a magic spell at the Will-o-the-Wisp. Almost all types of spells work, except spells that paralyze, silence or poison.
Equip an enchanted, Daedric or silver weapon if the Will-o-the-Wisp gets close to you. Attack the monster a few times and then back away before it casts a spell on you. Do not use normal weapons; they have no effect on the Will-o-the-Wisp.
Restore your health or magicka with a potion if the Will-o-the-Wisp drains it. Keep attacking the Will-o-the-Wisp until it dies.