Tailslap of the Dragon and Rainfall
The 2 Assassin skills (Metal) Tailslap of the Dragon and (Water) Rainfall are bugged, I've talked with Terry already about Tailslap of the Dragon and he's confirmed with the developers that it is bugged and did not get bugged on the Chinese Version, levels 5-7 are suppose to see a huge increase of power and for that reason consume a ton of mp and hp from the user for using the skill much like Soulshatter for Wizards, however the move is glitched to only do minimal dmg for a high level skill.
Rainfall is bugged in the fact that leveling it up is pointless, the skill stays the same with each level up, just using up more MP to cast.
I just wanted to put these 2 skills out there as the ones I know, I'm sure theres more but I'd appreciate it if these and the rest of the skills that are bugged would be fixed soon.