key (on a piano or computer keyboard) / button (on a mouse or other device) / chemical bond / linchpin
键
=
建
+
钅
:
Blob the Builder (建) built a fort out of keyboard keys (键) to defend against Joan of Arc (ji) who attacks him and his fort with a golden harpoon (钅) in the anthill's bathroom (an4).
Blob the Builder (建) and Joan of Arc (ji) want to construct (建) a Go (廴) field in the anthill's bathroom (an4), so they paint the field on the floor using decorator's brushes (聿).