恨なし (恨がない or 恨なす?)


I'm reading a text which uses a lot of classical grammar and there's a
sentence which I'm not sure how to translate.  

> 同胞に恨なし、遂に魔の物を統べる魔帝をも討ち負かせり

  
The text is about a swordsman and the part I'm not sure about is [ 恨なし ].  
Is it a shortened version of 恨みっこなし which means "no hard feelings" or could it
be 恨なす? I'm not sure if it can be written like this...  
The reason why I wrote it like that is because in a text from the same series,
there is also "同胞に仇なしたる", in the dictionary there is 仇なす which means to
resent; to bear a grudge.  
  
So, I believe it's the latter meaning, as in, the swordsman bore a grudge
against his brethren, but it's plausible that it could also mean that he
didn't bear resentment towards them...  
Because of this text, I have learned some aspects of classical grammar but I'm
not sure about that part in the sentence.

