Ice Tortoise

The Giant Ice Tortoise is a Hardmode mob that is found in the Underground Snow biome. It attacks by spinning inside its shell and jumping at the player. It can deal massive contact damage and it flies with frightening accuracy, so one must take care when fighting them if they are not well equipped for their devastating assaults.

Strategy
When the Ice Tortoise hides in its shell, it will take very low damage. The quickest way to defeat it is to attack it continuously so it can't retreat into its shell. A very effective weapon for this purpose is the Cutlass,since it has a very fast swing speed and good amount of damage. Also, the Ice Tortoise does a considerable amount of damage so I would recommend that you should obtain a weapon with high knockback.