thanks for the replies, guys, i think the first idea’s out for now. 
anyway, a quick sketch for the third idea - a huge amount of story behind it. because ive not translated it into english yet, heres a short description for the image:
finally the surviving blacksmith master meets the tenth dragon. he hands the weapon to him and requests to finish the tenth piece of the sword (there will be nine dragons engraved and one empty space where the tenth will be placed). though it will cost the price of eternal life, the dragon agrees, a hint of triumph on his face. his gift will guarantee the safety for the realms that are about to be laid waste by war, but also will secretly unleash a sinister curse upon the weapon and all those who will touch its cold metal, bringing days of darkness - as he is the black dragon, it goes well with his plans.
(complete story ill post on the next couple of days)
hope you like it 
