Fischl is a really powerful character on her own, but with the right team composition, you can even further maximize her already strong abilities.
You can stop being a Werewolf in The Sims 4 by drinking the Wolf-B-Gone cure.
The Water Breathing technique can only be acquired by completing quests from the Water Trainer in Waroru Cave.
You can become a Demon in Roblox Project Slayers by completing a task from Muzan.