Transmutation

Transmutation (変化系, Henkakei) is one of the six categories of Nen aura types.

Description
If a student changes the taste of the water in the glass during their water divination, they are a Transmuter (変化系, Henkakei). 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 pure aura.

Transmutation is often mistaken with Conjuration due to their similarities. 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.

Hisoka states that transmuters are whimsical liars. Transmutation users have unique attitudes, and many are regarded as weirdos or cheaters. They rarely reveal their true intentions.