Hello!
I've completed this a number of times for myself and for others. If you need help with "Sword Reforged" and need to get those kills within thirty seconds, add me and I'm happy to help! All I'll need from you is to be in a party as communication is key, that way we can get your quest done and that new beautiful sword in your possession.
Let me know! If you're adding me for that on the PS, please let me know who you are when you do.
Otherwise, I wish you all the best of luck on your quest!