I don't see this mentioned here, but I just learned (since I needed 357 points to break it [and I got 57 points in Dynamis tonight]) that you cannot use your weapon and expect to gain points for it in Dynamis. They will not count, sadly.
Hmmm, sent in a quest description awhile go, guess allakaz never got it, but the quest is:
Realm: Outlands Start Area: Norg Quest giver: Jaucribaix (K-8) Type: Weapon Skill Max Party: 0 Related Areas: Kuftal Tunnel Related Mobs: Kettenkaefer Min level: 71 Max level: 75 Reward: Tachi: Kasha Items Required: Tachi of Trials
You must be level 71 and have a Great Katana skill of 250. Head on over to Norg and talk to Jaucribaix, he will give you the Tachi of Trials and a key item weapon's manual. Your goal here is to take off the latent effect off the Great Katana. This "cleaning" requires you to use weapon skills and perform skillchains. Each weapon skill and skill chain must be performed on a mob easy prey to increadibly tough. Each weaponskill and skill chain you perform gives you points for your Great Katana. You must gather 300 points for the latent effect to clear off.
Point system roughly goes like this:
A Solo Weapon Skill: 1 points Ending a Level 1 Ckill chain: 2 points Ending a Level 2 Ckill Chain: 3 points Ending a Level 3 Skill Chain: 5 points
After cleaning your Great Katana, head over to Norg and trade the Tachi of Trials to Jaucribaix. He will give you a key item map and tell you to head to the Kuftal Tunnel where you must fight a notorious monster. Head on over to the Kuftal Tunnel, there head to the K-7 ~ L-7 area on the second map. There you will find a spot on the ground. Examining that spot spawns the notorious monster Kettenkaefer a beetle type monster.
A balanced party of 70+ should be able to take out the beetle, i brought with me a 74 PLD/WAR, 73 BRD/RDM, 70 DRK/THF, 73 BLM/WHM, 74 WHM/SMN, and a 71 SAM/WAR (me).
After defeating the beetle, recheck the spot on the ground to recive the key item: "The Annals of Truth". Go back to Norg and talk to Jaurcibaix and he will congratulate you on your efforts and rewards you with Tachi: Kasha!
This is the great katana that is used for the weapon skill quest for Tachi: Kasha. When you are level 71 AND your great katana skill is 250+, go to Norg and talk to Jaucribaix. He will give this great katana to you. Complete the quest and Tachi: Kasha will be yours to use.