The "Dark Fist" technique is a legendary martial arts move. If performed correctly, it can supposedly cause the target to become temporarily blind. However, it's not known whether this move is actually possible or merely a myth.
The Dark Fist was allegedly first performed by the Master Goccix Song of the now long gone country of Bint. It was said that Master Song blinded a great monster called Troccilix in the year 14,820 using the special move.