Iron Dragon's Sword

is an Iron Dragon Slayer Magic Spell.

Description
The user transforms their arm or leg into a large, jagged steel blade, similarly to Iron Dragon's Club, but, rather than blunt power, this spell has cutting power, thereby making it potentially deadlier. The spikes along the blade's edge make its slashes more painful and dangerous, and the weapon's length can be increased to reach enemies who are far away from the user. The blade is also sturdy enough to function as a shield of sorts. In the anime, the sword can also function as a chainsaw, effectively increasing its damage.