Battle of Turai's Procession

Overview
Quest Summary:
 * 1) Join the Centaur troop in Turai's Procession.
 * 2) Stand your ground against the horde of nightmare creatures.

Obtained from:
 * Mirza Veldrunner in Turai's Procession

Requirements:
 * Ancestral Anguish
 * Crossing the Desolation

Reward:
 * 4000 XP
 * 400 Gold
 * Kournan Coin

Dialogue
 * "[Difficulty : Master] Our scouts have spotted a large army of nightmare creatures from the north. We must stand and fight! Join me, heroes, and show these demons they have underestimated the Veldrunner pride! Follow me to the front lines!"

Walkthrough
Here is how I succesfully finish this quest with Heroes(Monk, Elementalist and Necromancer) and Hentchmens(war, mesmer, elementaliste, and Paragon). My charactere is a Monk. When the quest begin there are 3 groups of monsters that gonna rush you. One from left side(#1) and two from right side(#2,#3). Rush the left side group(#1) and kill them. When you kill them, another group spawn(#4). Kill them. And another group spawn again(#5), kill them. After that, its tricky, you have 15-16 monsters(#2,#3) on the quest starting point. They are all linked. You have to rush them and kill healer fast. (double meteor shower is pretty usefull) When you lose 4 members of your team, retreat and ress them. Kill almost all the monsters group until a new group (#6) of monster spawn on right side. Dont kill all the monsters from group #2 and #3 because you gonna make the group #7 spawn. Keep spawn separated like that, kill #6 without killing the last of #2 group. and kill everysingle group that spawning. At the end, the Margonite Seer Spawn (with a group of monster) they come from left side. Kill them to finish the quest. Hint: Keep few candy canes in your bag, that can help.