Ull is a brute, relying on powerful melee attacks and high health. He is encountered at Ull's Fortress. Strategy: Keep your distance and use ranged weapons (bow, thrown spears) to chip away at his health. Fire is highly effective against him, so use fire bombs and light your weapons. Command a strong beast (like a Bear or Sabretooth) to distract him, allowing you to get in free hits. Dodge his charges and heavy club swings. Focus on headshots with your bow.
