User blog comment:KodachiZero/Version 2.8.0 Changelog/@comment-28010705-20160923100417/@comment-26432452-20160923130713

Haha no, the usual 3* forgers like blade or spear forger.

That thing didn't drop at all on me so I need to farm 1* rifle forger for Kisa's weapon on her trial quest. It was so common before so I usually could maxed up my weapon easily but now it's pretty rare.

That thing on your link is called forging mats I think.