To beat Cazador in Baldur's Gate 3, follow these key strategies:

• Rescue Astarion quickly: Astarion is trapped in a ritual and must be freed within three turns, or he will die and Cazador will ascend, making the fight much harder. Use the Help action to free him as soon as combat starts

• Use Radiant damage and sunlight spells: Cazador is highly vulnerable to radiant damage and sunlight. Spells like Daylight , Moonbeam , and Sunbeam deal continuous radiant damage, prevent him from using Mist Form, and impose disadvantage on his attacks and checks. Casting Daylight on him early in the fight is crucial

• Equip magical weapons: Since Cazador resists non-magical physical damage, ensure your melee characters use magical weapons to bypass his resistances

• Control the ritual sources: Cazador gains buffs from nearby vampire spawn involved in the ritual, increasing his HP, damage, and speed. Defeating these spawns quickly or disrupting the ritual by freeing Astarion stops these buffs

• Tactical positioning: Use spells like Misty Step to position your characters behind pillars or out of direct line of sight. Separating Astarion from the initial ritual scene until combat starts can prevent Cazador from buffing himself immediately

• Focus fire on Cazador first: Prioritize dealing massive damage to Cazador to end the fight quickly before he can fully buff or heal himself. Using high-damage spells and attacks early, including area-of-effect spells to manage minions, helps

• Optional exploit: On lower difficulties, you can shove Cazador off the ritual platform for an instant kill, though this may not work on higher difficulties or in Honor Mode

In summary, rescue Astarion fast, use radiant damage and sunlight spells, equip magical weapons, disrupt the ritual buffs, and focus on killing Cazador quickly while managing his minions. This approach will maximize your chances of victory against this tough vampire lord boss