How do u get a really high multiplier and loads of xp after finishing game cz i went to old graveyard path and the undead dont pop up anymore =S

They wont pop up at that point anymore but if you go to (I think) the zone right after that called Clifftop Path they will continually respawn at the top of the hill to the left where there is a chest that contains an augmention. Then you can get a lot of experience. And try using Physical Shield if you aren't already doing so, cause then it doesn't reduce your Combat Multiplier every time you are hit...

you can go to the grey house the zombies are there now and you can gain lots of xp and good points just buy hitting them once with the sword of aeons[i got my cm up to 27 just by doing this][remember to go to the demon door that wants your multiplier to get higher ]