Those three fortresses only be penetrated by means of a single shafts; but in no other way can they be pierced. There exists no other person cxcept Stana, who is able to pierce them with a single arrows.
एकेषुणा विभेद्यानि तानि दुर्गाणि नान्यथा। न च स्थाणुमते शक्तो भेत्तुमेकेषुणा पुरः॥