What is the special ability of the Black Bow?

The Black Bow has the same power as the Dragon Gear, and its special ability is that it can produce some kind of ****ing effect with the Dragon Gear, giving the power of the Dragon Gear to the arrows of the Black Bow to achieve long range strikes

But it seems that a single person who uses the Black Bow has a great burden, and the power of the Black Bow is so great that it can destroy a city, but it costs the user his or her life, so it can be seen that the power of the Black Bow has a price for the user, which is physical damage or a shortened life span.

And in the ninth volume of the novel, Tegler, who had lost his Black Bow, was fighting an enemy with Elizabeth when something similar to the Black Bow appeared in his hand, and he escaped from the attack.