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All attacks are permitted except to vital points.
Literal
Vital-points [object-を] except, all [genitive-の] attacks [object-を] permit.
A combat-rules fragment. 急所 ('vital points,' 'weak spots') is a compound: 急 ('urgent, vital') + 所 ('place') = 'critical spots' — used in martial arts, medicine, and strategy for places where damage would be fatal or disabling. ~を除く ('excluding X,' 'with the exception of X') is a formal noun-modifying phrase, using the verb 除く ('exclude, remove') in its dictionary form before a noun. 認める ('to recognize, to acknowledge, to permit') is used here in the 'permit' sense — blessing something as allowed. The sentence has the terse authority of rules text.