Arcane is a modifier that allows you to manipulate the marking by adding runes, glowing effects, or extra colors. Cannot affect the entirety of the marking. Can only affect 1-2 markings.
Drops from the bosses: Royal Mimic, Arachne, Archangel, Celestial Dragon, Dullahan, Genie, Golem, Kutsune, Lava Golem, Unicorn
View the marking information here.