To get the 'secret' hero, just get the 1st Arthas head, from Arthas, then head to the ANGEL in ILLIDAN. Kill the angel until you get 2nd Arthas head, and suicide. Doing -kill or getting killed by the devil, both works.
I hope this helps (This is how I got my 'secret' hero.)
Also, anyone know what is with the swordsman in Lv. 400 area? I attempted to search everywhere, and I haven't found anything. Please help, it's urgent. Thank you for reading. (I think that the statue does something; it seems to be something to do with combining. At least, that's my assumption from reading F9.)
If you can find out, please help

Thanks for reading-
Zeffendorpher