At the end of each long rest, the lich chooses one form of artistic expression, such as song, poetry, dance, fashion, paint, or similar. Until it finishes a long rest, the lich has immunity to one type of damage, which is associated with its artistic expression. For example, a lich expressing art through song or poetry has immunity to thunder damage, a lich expressing art through fashion has immunity to slashing damage, and a lich expressing art through paint has immunity to acid damage. This trait can't give the lich immunity to force, psychic, or radiant damage.