Genjutsu: Unknown Fire

This genjutsu is cast by pointing at the target and a fade purple wave is released from the finger that when it reaches the target, causes them to see a ring of blue fire around them and then see themselves ignite with blue flames.

Trivia

 * The term is a literal translation of "unknown fire", but can also mean "Phosphorescent Foam". It is also a term given for will-o-wisps and is the name of a Japanese destroyer.