None you get a battle core at crsoc
defeat gen. varax (boss fight)
u fight him at one of valencia's quests.
A drive unit in dragonfable is used to merge with scrap metal in doctor voltabolts robots fight. There is a 2% chance to get a drive unit all the other times you will get scrap metal. Hope this helps.
go to the guardian tower and train all your skills. then you'll have to fight him as your last one.
Sepulchure does not have a battle ID. You can fight him by talking to Elysia in Falconreach and fight Sepulchure from there. Beware though, you cannot truly beat him anymore (you used to be able to beat him with the DoomKnight armor by using Life Carve, but it's impossible to hit him now due to his dodge being ridiculously high).
fight a bunch of those robots
Chapter 5 cannot be beaten, unless you mean the boss fight. If you mean that then you must fight along with other DragonFable members to defeat the waves, only when the bar reaches 100% will you be able to battle the boss.
go to the southern side of falconreach and go left then talk to xan
He is a paladin, that can fight with you (not against you) and his damage ranges from 10-100 (his highest, ((for me)) was 150!)
there is adventure quest, adventure quest world, fight my dragon, the eclipse, death of horror, wizard 101 and i think there is one on adventure quest world +
Robot Jox?
gundam?