Track him, find him, kill him

King Dave is fighting the evil Necromancer Thrall the Tyrant for years trying to reclaim his throne and reunite his kingdom under his banner. He has amassed a massive army of 80,000 men for a final assault and is currently attacking the stronghold of his opponent. The problem is that Thrall can resurrect dead soldiers over and over again,using black magic. Your mission is to infiltrate Thrall's Stronghold now that his army is still busy with the battle that raging and kill him. The King can buy you 3 hours to exterminate the Thrall before his army is defeated and then Thrall will have a new unstopable army of 80,000 undead in his possesion.