[susan53]

It may be an error. Where did you get this from? The only site I could find it on was a Chinese site, so I would assume it was written by a non-expert user of the language. But as I couldn't understand the Chines script surrounding it, I'm not sure.

Reduced relative clauses (ie those where the pronoun and auxiliary are ellipted) only usually occur when the auxiliary is Be - not when it's have. If have is ellipted in this way, it's often done to achieve a poetic or dramatic style - this is an example I found on the net. It comes from a song by Vox Humana :

I saw the black crow, I saw the night
I heard the arms call, told me to fight
I've seen the riders running the race
But I've never seen angels fallen from grace

If the sentence was written by an expert user of English, the use of the word oblivion (also fairly poetic in style) suggests that this might be happening here too. But we'd need to see the sentence in its full context to decide.