from WIKI

Talk to Gellir Frostshield to start the tournament. A fee of 100Gold is automatically deducted from your character upon confirmation. Your character must have the quest Round 1: Fight! in order to enter the tournament. Obtain the quest from Magni the Bison if this is the first time your character is entering the tournament or is re-entering the tournament after previously winning the tournament. Losing the tournament will keep that quest in your quest log.

There are a fair number of builds to beat this quest.
Here is the TALK PAGE with some builds

Its a quest reward from Eye of the North
Falling Out

Requirements

* You must first listen to the conversation that Sergeant Weststar is having with his troops just outside the Southeast exit from Longeye’s Ledge.
* To obtain this quest you must then locate the body of Brent Poltroon, despite being dead, he is the quest giver. Brent’s body is located north of the portal to Sacnoth Valley.

Concise description
Spell. Target foe is struck for 54…90 piercing damage and begins Bleeding for 5…25 seconds. This attack has a 10% chance of doing an additional +540…900 piercing damage. If this attack hits a Charr it has a 25% chance of doing an additional +540…900 piercing damage.