The Landowner is a giant, hulking robot which constantly stalks you, wielding a cane. He has two dogs which accompany him. He will stun you with a shockwave from his cane, and then finish you off with a quick stab to your body. He has at least one guard dog with him at all times. He is also invincible, so it is best to keep clear of him. If seen, the Landowner will stalk the player around the island. Stealth will not avail the player whatsoever, as the Landowner will move straight toward you even if you are not visible to him. He will even turn Squires against you. The only way to get rid of him is to get to a boat and go to another island. If spotted it might be a better idea to reload a previous save game than flee.
UPDATE: From scattered anecdotal evidence, it may also be possible to escape the Landowner by leading him through an area which is occupied by one of the more self-serving robots, namely the Poacher. It may also be possible for the Squire to be provoked by him, and occasionally even Hunters have been seen firing at him in the midst of larger 'robot vs. robot' battles, although the latter two are far less reliable. Superficially, this diversion seems to cause him to lose interest in you, but proceed with caution, as it may well be easy for him to spot you again almost immediately.
This chap is an aberrant mechanical ultra-toff. He’s a leader among hunters, and the nightmare gaze of his glowing monocle means near-certain death, and at the very least lots of peril. With The Landowner in play, the player is truly in trouble – his tracking skills and his riflemanship are peerless. Fear him.
And on the forum:
The Landowner is a little taller than one of the small houses and will stalk you relentlessly once he's spotted you.