Demons: From the Start, I Deduce Martial Arts Realms

Demons, monsters, ghosts, and fiends: those that attack by day are demons; those that harm people at night are ghosts; those that appear in every season are monsters; and those that come and go without a trace are fiends. Demons without mist are the most common, blending into crowds with their faces unknown. Ghosts with mist possess great powers, coming and going without anyone knowing.