you get this item from Dynamis-Xarcabard location is H-9. forgot Nm name but it drops this i believe you have to examine a ??? to pop it after you have this, go to the sanctuary of zitah to get a cut scene(go to the monument, L-6 i think, where you do one of the ZM missions), the dagger will talk to you.. after that go to the goblin trade him the ornate,batardeau,and a whooping x100 Hundred byne bills, that will be 9900 1byne bills. come back after a week, and Congratulations you'll have your Mandau .