There was once a planned fourth Disciple of the Land class in the original 1.0 version of FFXIV, called 'Shepherd' (SHP for short), with their class icon apparently a pair of antlers, and they even had an empty (locked) Guildhall in the old pre-Calamity Falcon's Nest. Whatever the class's mechanics or purpose was planned to be is unknown, but it was speculated that it was to be some kind of 'trapper' class that caught beasts and monsters for their hides and meat, but nothing is known for certain.

However for whatever reason it was never finished and hence was dummied out of 1.0 completely. And alas, as all references to it have disappeared in ARR (the Guildhall has disappeared and was not 'rebuilt' in post-Calamity Falcon's Nest), it can be assumed SE have long since abandoned any intention of adding it sadly.