Transmutation (変化 Henka)

If a student changes the taste of the water in the glass during their water divination, they're a Transmuter. An affinity for transmutation means a person can change the properties of their aura to mimic something else. Similar to emission, things created via transmutation are still pure aura. A simple way of thinking about it would be that transmutation allows your aura to mimic properties of a substance, whereas conjuration allows you to change your aura into actual substances. Transmuters can copy the properties of real things. For example, Killua Zoldyck uses his aura to copy the properties of electricity. Transmuters can also give their aura properties that don't necessarily mimic real things; Hisoka's "Bungee Gum" copies and combines the properties of rubber and gum. Transmuted substances are invisible to people unaware of the existence of Nen.