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Fire Release: Dragon Fire Technique

From Naruto Fanon Wiki

The user breathes fire along a cord or any other type of long object. While the technique is shown in the anime to be even larger and more devastating than Fire Release: Great Fireball Technique (and being able to melt rock), in the manga it is shown to be nothing more than a small burst of flame running along a line of wire. Also in the anime it is shown that it can used separately without an object to travel along.