I know this isn't really a question about crafting but does anybody know what bosses drop vampire lord weapons? Ive been killing Dayarrus in Bangkorai and i only seem to be getting armor.
The loot tables are smaller in the public dungeon Razak's Wheel ... so your chances of getting a weapon should be improved there if you're willing to give it a try.
Overland treasure chests will also drop weapons occasionally (as indicated by the wiki link above).