Deerclops

The Deerclops is a boss Mob added in the "A Winter's Tale" update. It can destroy placed Structures, in doing this it will drop half of the raw materials the structure was made with. It is agressive to the player unless other creatures like Pigs draw its attention, the player will lose a lot of sanity when standing near the Deerclops. They take four blasts from the Ice Staff to be frozen.

The Deerclops will drop Meat and a Deerclops Eyeball when killed. Also they only spawns during the winter, it takes 3-6 days for a Deerclops to respawn after being killed. They will despawn when offscreen during summer.

Strategy
You can fight him pretty much just like how you fight every single other enemy. Get close to prompt him to attack, though you will need to move further away because he has greater range, once he is done just get close and smack him 2-3 times, rinse and repeat.

The Deerclops can be put to sleep by a Pan Flute or Sleep Darts but doesn't sleep during the night. Fire Darts seem to be very effective against the Deerclops. Beefalos are good help while killing deerclops but you have to wear a Beefalo Hat and get hurt by the Deerclops in front of the Beefalos.

Another way is to freeze him and attack him from back.

A third way to take him on with minimal risk is to find a Treeguard and trick the Deerclops to strike it with his Area of Effect (AoE) damage. If done correctly they will start fighting. A tall Treeguard will always win and mid-sized ones are evenly matched with the Deerclops

Warning
When the Deerclops is spawning you will hear him moaning and growling, it works like how you hear hounds barking and growling when they are about to arrive.

The Deerclops does Area of Effect (AoE) damage so try to keep your distance if you can. If you are going head on with him make sure to wear armor, as they can kill an unarmored player in a single strike

Teasers
Pictures of the Deerclops appeared in the update teaser video for the "Long Live the Queen" update, at around 30 and 45 seconds into the video (see pictures).

At the end of "A Winter's Tale" teaser video, the screen will go black for a brief amount of time. During this time, the growl of the Deerclops is heard