There is zangetsu (in both shikai and bankai forms) and you can get them from cicero's shop on dragon coins :|
with weapons
the doom weapons are level 8 weapons and do lots of damage.
Merger Weapons commonly have requirements on items needed to merge for them or upgrade them, it all depends on the weapon.
the three doom weapons i would say
do the packing up quest (part of the fire war chain)
In quests like defend the keep, sir jing's weapons and other ones
there are a lot of good weapons, check out this link:http://dfwiki.com/index.php/Best_of_the_Best
you can check it at Dragon Fable Wiki>Weapons>Weapons listings by level>Category:Level 16 Daggers
u download them at wpe pro or crash override
You buy it at Lim in the Falconreach weapons shop. You need a dragon amulet though.
use fire element based weapons and spells. that's the best way i can think of
To do the Stocking the Shelves quest in Dragonfable, you need to go to Warlic Zone and talk to Nythera or Warlic. On the quest, you need to find 5 or 6 plants. There also are special weapons you can get.