The subject of this article originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
The Morgul bow was a poisonous, long-range bow wielded by the Gundabad Orcs, who had taken the Morgul venom from the Morgul-blades of the Ringwraiths. The bow appears as a grimy, black bow with sharp black arrows. Unlike a morgul-blade, the victim does not turn into a wraith if not saved, but dies due to excruciating pain.
During the late Third Age, it is seen only once; wielded by the brutal Orc chieftain Bolg, who had shot an arrow from the bow and hit Kili. Likewise, the poison from the Morgul-blades continued to go through Kili until he became sick and was forbid to continue with the Company, but was healed with athelas and a Sindarin chant by Tauriel, who had came to Kili's aid in Lake-town.