The #monster extended command allows you to use the special ability of a monster form you are polymorphed into.

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Monster	Ability
Cave spider	Spin web
Dragon	Breath weapon
Giant spider	Spin web
Gremlin	Split while on a fountain
Hell hound	Breath weapon
Iron golem	Breath weapon
Lurker above	Hide
Mimic	Mimic an item
Mind flayer	Mind blast
Nymph	Remove iron balls caused by punishment
Piercer	Hide
Pyrolisk	Gaze
Shrieker	Shriek, aggravating monsters
Trapper	Hide
Unicorn	Use horn
Werecreature	Summon other creatures of the same type
Winter wolf	Breath weapon