Lion's Arch to Marhan's Grotto?

I've not completed Prophecies so I have no idea how to get there. Some help would be appreciated =D

Just keep doing missions and primary quests. You'll need to get through the jungle, and the desert, and you'll find yourself in Droknar's forge. It's a short walk east of there.

Okay, cool. Thank you.

Get a run from Beacon's perch to Droks -> Ice caves of sorrow (Mission) -> iron mines of moladune (mission) -> Walk from thunderhead keep to marhan's grotto.
Would be the fastest way I guess.

Since you don't say how far you've gotten in Prophecies, it's hard to advise you. It would help to know the last mission you completed and what outposts you have unlocked. Have you reached the Southern Shiverpeaks? Crystal Desert?

Are you looking to hire a runner? Then try advertising in LA or Beacon's Perch for a runner to Droknar's Forge, and advertise in Drok's for a runner to Marhan's.

Are you looking to fight your way there or run your way there yourself? Then see Map of Southern Shiverpeaks and other Prophecies maps to choose your route. If you're starting from LA, go to Beacon's Perch and south from there.

To get there by playing, complete missions from wherever you are until you reach the Thunderhead Keep outpost and then make your way to Marhan's Grotto in the southwest corner of Ice Floe.