Ween yourself off arrows. It's a crutch, and not effective against Yagluth as he's resistant to pierce. Frostner is quite good against him but do note he is not considered weak to crush (even though he probably should be) nor spirit, he just takes normal damage from both. Swords are useful as well thanks to their spammable swings and quickly moving after.

Use stamina potions when you need them, pack fire resistance, two or three per person. Don't bother blocking in this fight, just run. Do a lot of weaving in and out as he does his meteor. He will try to be sneaky and chain his beam attack after meteors, dangerous if you ran out of stamina. Eikthyr power is highly recommended so you can run more and by extension do more damage when you get a window. He has A LOT of openings, take advantage of each one. Every move is super telegraphed.

It's good practice to set down base structures (benches) around the boss spawn before you fight it, to reduce the amount of mob spawns to join the fray. If you need a breather you can dig under his spawn for a place to be immune from his meteors and get Rested back if needed.

Friend and I duo'd him after H and H, they did seem to buff him the fire did more damage than before. Give yourself some time to restore HP and use the 3/4 hp per tick foods.