Normal Illusions
When the series started, Mukuro was the first person who showed the power of Illusion. An Illusionist uses this power to make their enemy feel, see, hear, or smell things that aren’t there. Basically, every Illusion is dealt through the mind. In the case of a first-class Illusionist, it's possible to even kill the enemy with Illusions; for example, Chrome created an Illusion of lava erupting and Viper (Mammon) said that if he believed it was real for one second, he would have burned. This proves, however, that if the enemy is aware that they are experiencing an Illusion, it will have no effect on them and does not exist. Normal illusions take control of fear and forces other people to be afraid.
Real Illusions
When an Illusionist use their Illusions combined with the power of Mist Flames, they will create Real Illusions and the Illusion would be experienced in reality.
During the introduction of Mukuro's First Realm, it was stated that it grants him the power to create Real Illusions capable of manifesting in the physical/real world. However, it wasn't until during the Future Arc that Real Illusions were seen. Sometimes real illusions are hard to tell between normal illusions. The real illusions also have the power to hurt people.
Mukuro also made use of this to materialise himself during the Mist ring conflict to fight Mammon, when fighting Glo Xinia in the future Kokuyu land with Chrome, Ken and Chiksua, as well as during the choice arc, when Tsuna and friends were fleeing from Byakuran.
List of Illusionists
Template:Tsuna's Family
Template:Millefiore