Backtrack a little and follow the path around the right; upon entering the main area Tamer Nicoli will be to your left. Defeat him and head to the western tower.
Pick up the plank and head to the eastern tower. Place the plank (it will glow green when you place it) to bridge the gap so you can jump across.
Head to the top of the eastern tower and defeat Kastus.
Pick up the plank and head back down the tower. (You can place the large end of a plank on top of the smaller end of another. Doing so will allow you to carry more than one at a time if you click the lowest most plank.)
Return to the western tower and break the wall up the ramp.
The wall in the western tower becomes attackable when you have killed Kastus (Odaufe's brother)
You can place the planks at the bottom of the tower as they will not sit on an incline. once the wall is down you can place the planks on top there so you don't have to run that far.
Head to the top of the western tower and defeat Odaufe.
Gather the four planks if you haven't already and bridge the gap across the snowstorm just down the ramp from Odaufe. Follow the battlements around to ( 64, 20, -215 ) /waypoint 64, 20, -215 where there is a climbing wall down.
Talk to a freezing goblin ( 102, 1, -180 ) /waypoint 101.93, 0.63, -179.92 next to the snow boulder. Don't miss this step.
Kick the snow boulder blocking the path. A message will appear on-screen from Ice Maiden D'Ina. She no longer appears on the pillar in the middle of the zone.
Click the Ice Dragon Egg twice to destroy it. A Hatched Ice Dragon will spawn and encase you in ice and escapes.
NOTE: If you kill the dragon before it has a chance to encase you in ice, the quest becomes bugged and you must re-enter the zone and start this quest from the beginning. So make sure your mercenary and pets are on passive and you have no reactive items equipped.
Once the spell wears off gather the pieces of the egg. (The spell takes about a minute to wear off.)
Snarf Frostfoot will come running to the egg platform. Speak to him to finish the quest.