1. How do you get alexander? Thats the last item for the last quarry i have to do, so what is it???

2. Do the other seven-star swords become stronger as you combine them with certain leveled swords, like the desert seeker did?

3. how many seven star swords are there?

i think theres seven of them. at least thats what my friend told me. he played over 500 hours of this game.

1.You can get Alexander by combibing Murakamo Type X and either volcano crusher or shining horn. Or by making it in the factory.
2.Yes I believe thay do get stronger

to learn how to lvl and where to find the star swords and the other special swords check out
http://www.gamefaqs.com/console/ps2/file/929240/46872

quote 46gryphonLord377

to learn how to lvl and where to find the star swords and the other special swords check out
http://www.gamefaqs.com/console/ps2/file/929240/46872

(these swords upgrade Standard,II,III and a fourth with a new name)
there r 11
Desert seeker
Ixon
cosmolore
great ceaser
pride of kings
duke nightmare
pegasus lord
libra king sword
zeo sychros
sword of sins
dorgenedge

the alexander isnt one of these swords but is a very useful sword to creat some of the most powerful sythesists in the game