The elusive Fireflies of Thysia are rumored to give anyone who is able to catch them prolonged life. Sir Hork neglected to tell Sir Melbin the only way to attract them is to sacrifice a truly pure soul.
A quick illustration using some BMS kitbash assets as well as a few Blender addons I haven't tired: Geoscatter & Easyfog. I started out really liking the purple version, but ended up leaning towards the orange. There are a few process gif there as well.