Talk:Long Blade/@comment-26892028-20150815043234/@comment-26113680-20150819033807

Terminal->4th Crafting->4th Synthetic cores

Then you select which grade pf core you need.

1st Row is for Kurogane Rank 1

2nd Row is for Rank 1-3

3rd Row is for Rank 4-6

4th Row is for Rank 7-8

5th Row is for Rank 9-10

Hope this helped!