Wickerman

The Wickerman is a large, tree-like creature with the skull of a deer making up its head. It stalks the wide-open forest, but is afraid of warmth and buildings. You can hear his body creaking as he walks nearby.

Mechanics (Spoilers)
If you hear him roar, it's best to turn around and find the nearest source of protection: fire, or a building.

Player Input:

"That roar is the scariest thing that I have ever heard. It evokes a visceral response and makes my entire body freak out - and most of the time causes a mic-peaking scream in return." (ShieMonkey)

Once he roars - you must find a safety. He is fast and will catch you if you're just running. Fire, safe house or death are the only outcomes in that situation.

In Story-mode:

He is more predictable and its easier to know where to go to escape him. Stick either indoors, or near a campfire in the woods. Plan your movements in advance before just running out into the woods, and always know where you are going to go!

In Cases:

He is one of the more difficult monsters to face in cases. He can come upon you suddenly with very little prior notice or sound cues. Fire bowls are the deterring landmarks to look for, instead of campfires in these maps. You are also safe inside the Cabins (Kept and Un-Kept Hedges) and mineshafts (Forest).

'There are cases of him clipping through the fire bowls in cases. Make sure you move around the bowl as he approaches to keep it between you and him.'