The sword is called Aqueric Force. Do the "Its a Wash" quest from Valencia.
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when you kill hydra while coming to flaconreach you get the sword
The Icy Sword can be brought from Dragesvard's Weapon shop or Moonridge's shop.
if you are a gardian in adventure quest, you need to verified the guardian in dragonfable, so you can equip the guardian armor, you can get the guardian sword in willowshire, then go to the tower and get all the keys (the gems) then you will see a ghost guardian and press "shop", and there, you get the guardian sword.
you need to wait till frostval and then you got to get enough coals and the togsmas sword gift
there are a lot of good weapons, check out this link:http://dfwiki.com/index.php/Best_of_the_Best
Artix is found in The Necropolis
depending on your level best damage is 50-80
"By the sword" means by force.
The cast of Aquellas palabras - 1949 includes: Modesto Cid Ana Mariscal Mari Pili Pararnau Fernando Sancho
there is 1 called brother's blood, and if you can find xan in falconreach, you do his powerful challenge.
The overall boss is unknown, however Shadowscythe (Necrotic Sword of Doom), is probably closest to an overall boss.