The Savage Blade Quest is given to u by Curilla.
You need Lvl 71+ and Sword skills 240+ and then she will give Writing of practice & Sapara of Trials. Now you have to use the Sapara Of Trials until u saved 300 Points from everytime you use a ws or renkei. So it is best to keep doing Light Renkei to get rid of the Latent Effect. Once the Latent Effect is gone, you talk to Curilla again and she will then give you "Map Of Trial". The map sends you to Boyahda Tree and you have to examine the ??? at I-6 on the second floor I believe. Once you checked the ???, A NM called Girtablulu will appear. You have to defeat it. Once you killed the NM, examine the ??? and you will receive the "writing of a trial". Talk to Curilla once you the Key Item to finally get Savage Blade.