85. Headshot
they know that if one wanted to use a powerful martial technique, one need a strong body along with that person to reach the acupoint realm which is above the bone forging realm. what Rudrama devi just used is a powerful martial technique which can heavily injure a savage beast of the 5th order not through her body but through a sword in her hand.
as said if one wants to use a powerful martial technique, they need a strong body and have to reach acupoint opening realm but there is another way, that is by creating an artifact which is inscribed with an array through which one can use that technique and using this type of artifacts those below the acupoint realm can also use strong martial attacks during a fight but need more energy than one who uses through his body.