Originally posted by Hian Gomes:

His problem is the furlings and lox spawning durring yagluth battle

Originally posted by HamsterPants:

So, I don't think the game is that badly balanced, but the extra mob spawns in the middle of boss fights really do make things near impossible.

Mobs can only spawn naturally during the battle, the boss doesn't summon any additional mobs. Clear the ground before engaging, just like with any other boss up until that point. Don't fight at night or dusk, start the battle when a new day begins. You don't need to mess with terraforming, just use the finger-pillars for cover, take your time and recover if necessary. Bring potions. Yagluth is undead so spirit damage is effective.