[The Saucepan Man]

The Black Arrow used by Bard the Bowman to kill Smaug?

Horders fear me ... - It's victim, Smaug, was a hoarder.

My final battle I have seen - Smaug's attack on Laketown was its last battle.

My enemies' weakness discovered - Bilbo discovered Smaug's weak spot, which was coinveyed to Bard via Thrush messenger and it hence became the Black Arrow's target.

This time I do not recover / For as my enemy dies / with him I lie - The Black Arrow lies with Smaug's remains at the bottom of the Long Lake.