So... here it is.
What I had:
Level 16 Warrior/Monk (didn't use any monk skills despite equipping them)
I bought a number of Scrolls, namely Rare scrolls. One Beserker Scroll, one Slayers Scroll perhaps two keys.
I spent about 22k on keys and scrolls, but I did have 8 Slayer scrolls, 4 Beserkers and 4 Rampagers scrolls in case I needed them, but I had loads left over by level 20.
This only works, I suppose, if you are from Tyria and you first go over to Cantha. Take the mission 'Welcome to Cantha' and buy your scrolls and keys. On your own, without a party go out the indicated door and meet up with Mhenlo and co. Don't forget to visit the resurrection shrine and kneel before it to get any available powerups.
Sit through his waffling and eventually you can begin to follow the arrow until you meet up with the rest of Mhenlo's party.
Now march onwards following the arrow again on the compass. Just before you attack simply activate your Slayers Scroll and get about 300-450XP per kill (depending on level - I was getting 300xp per kill at lvl 19).
When you get to the Mesmer Boss usuaully clear all the annoying guys about him and then start laying into him. Just before he dies I flick on the Beserker scroll and get about 1,000XP-1,500XP. With the remaining time on the scroll I take out any nearby Jade Botherhood.
Each run takes me about 10 minutes and I can get 6,000XP per run, that about half your XP bar. I needed 3 runs to get to lvl 20, but its quicker than taking your prophecies character all the way round.
It's pretty obvious when you think of it, but it might help a beginner. It helped me.






