You may be overwhelmed when you begin looking at The Rust King. This boss is tough. You must learn to use your PoE 2 Currency well. The boss has many attacks. Others are quick, others are slack, though they all get about a lot. You must stay alert. 

Learn his patterns of attack first. He combines close and distanced attacks. Sometimes he charges at you. At other occasions, he throws projectiles. As long as you know his moves you can avoid him better. Use your quick reflexes. One of the best preparatory measures is to upgrade the gear with the appropriate Currency. This develops your character and makes it more resilient. 

Positioning is important. Keep moving around. Do not stand still. When he gets up a great assault, withdraw. In some cases it is preferable to keep up with him. His front is dangerous. Watch for visual cues. He lifts his arm or pauses, this means that something great is going to happen. Be ready to dodge or block. 

The second one is to carry the appropriate skills. Pay attention to the ability to stop his attacks. Slow-down skills also aid him. It is less difficult to hit him in case you can control his movements. Buy with your best PoE 2 Currency items that enhance your defenses or harm. The defense is important to live longer. 

Finally, be patient. This struggle may require numerous attempts. Keep upgrading your gear. Your u4gm PoE 2 Currency can be used to purchase improved potions and scrolls. It is sometimes the difference between a big difference made by a small change. It is important to remember that the boss is not easy but he is not impossible. The Rust King is beable with the appropriate strategy and equipment.