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A Toxi-Klang is a type of Klang also appearing in Grunty Industries of Banjo-Tooie. Similar to a Klang, it disguises itself as a normal steel barrel until being approached by Banjo or Kazooie, and then springs to life and attacks.
Defeating a Toxi-Klang requires either three regular hits or one hit from a Grenade Egg. Upon defeat, Toxi-Klangs will leave behind a volatile floating green gas called a Toxi-Gag, which latches onto Banjo and Kazooie and drains them of their oxygen, and can also be released when the Toxi-Klang is still alive. They are often found in toxic waste areas of the world.
Regular Klangs are incapable of dispatching Toxi-Gags. Furthermore, Toxi-Klangs have a distinguished toxic warning symbol emblazoned on their barrels, whereas regular Klangs do not. They also have toxic waste dripping out of their lids.