Grym is a boss in Grymforge and was probably the most frustrating fight I had in the game so far. He is resistant or Immune to everything and has tons of HP. But once I learned the tricks it became a very easy fight.
Tips for Fighting Grym
The first thing to know is that Grym has to stay superheated before you can hurt him. And this is done by getting him to stand in the lava. The heat makes his armor softer but if he cools down you can no longer hurt him.
The second thing to know is that he always attacks the last person that did damage to him. You can use this to pull him around the battle field.
The third thing that really made this easy for me was the big hammer in the middle of the battle field. Once he is superheated and pulled to the center one of your characters can pull a lever to bring down the hammer. This deals massive damage and I was able to beat Grym by doing this 2 times.
Video of Grym Boss Fight
Watch and Rumble. https://rumble.com/v3lweom-grym-boss-fight-baldurs-gate-3.html
Good Luck
I hope this helps and saves you some frustration!
