Angel Arm

The Angel Arm is a natural ability found in all Plants. Capable of a wide variation of forms, these Angel Arms are most commonly known for their usage by Knives and Vash in which they appear as enormous cannons capable of great destruction in a manner similar to that of a black hole. In the Anime, the Arms, at least for Vash, do not cause harm to organic individuals. Individual Plants require a catlyst for the Arms to appear, such as the two pistols made by Knives.this may be how Vash got the name "The Humanoid Typhoon".