While X'fal is one of the first bosses and designed to teach you about boss mechanics in Diablo 4, paying attention to his attack patterns and reacting accordingly will make this fight much easier. Enjoy your battle in Sanctuary!
Here's a concise guide on how to defeat X'fal, The Scarred Baron in Diablo 4:
Location:
X'fal is located in the Icehowl Ruins, which you'll encounter during the game's prologue in Act I, specifically during the "Darkness Within" quest in the Fractured Peaks region.
Preparation:
•Ensure you're at least around level 5 for a smoother experience, although you can attempt this fight at lower levels with good tactics.
•Make sure to use the Healing Well before the fight as it marks a point of no return.
Fight Mechanics:
•Wide Swing: X'fal will charge up for a wide swing. Dodge or move out of the way to avoid this.
•Mace Combo: He performs a series of mace slams, with the last hit potentially making you vulnerable. Keep moving or use evade to not get caught in this combo.
•Summon Hellions: X'fal will occasionally float in the air and summon Hellions. This is a great opportunity to attack him as he's relatively vulnerable during this phase. Use the environment to your advantage by luring Hellions behind pillars or obstacles where X'fal can't directly hit you.
•Leap Slam: He leaps into the air and slams down. A circular indicator will show where he'll land; move out of this area to avoid damage.
Strategy: 
•Dodge and Attack: The basic strategy involves dodging his attacks and then counter-attacking. Use your 'Evade' ability to quickly get out of harm's way and position yourself for a counterattack.
•Use the Environment: When he summons Hellions, use pillars or other environmental features to block X'fal's attacks while you deal with the smaller enemies.
•Attack During Summoning: When X'fal is summoning Hellions, he's vulnerable. This is your chance to deal significant damage.
•Manage Vulnerability: If you get hit by his mace combo, you'll be vulnerable, making it crucial to avoid subsequent attacks or heal if necessary.
X'fal Fighting Tips: 
•Stay Mobile: Keep moving to avoid his ground-based attacks and to position yourself advantageously.
•Timing is Key: Learn the timing of his attacks. His animations give away what he's about to do, allowing for well-timed dodges and attacks.
•Post-Fight Rewards: After defeating X'fal, expect to receive gold, XP, and possibly some common gear items like weapons and armor.
