So apparently there is a cheat going around that makes mobs unable to actually detect you in the game. This exploit in a nut shell gives you invincibility when running around in the game because no NPCs or Mobs can detect and attack you in the game.
There isnt a lot of testing going around with this ffxiv exploit but here are some cool things that it could be used with for helping you in the game.
First of all if you are running a final fantasy xiv leveling bot this will help you hunt in the harder to kill areas of the game since you can attack just one mob at a time if it doesnt pull multiple mobs on you.
Secondly this is extremely useful if you want to only pull a final fantasy 14 major mob to you and not get his adds. Just imagine how much easier late game boss fights will be when you can only have the single mob you need to kill come to you and none of his or her minions.
Thirdly this is great for in game ffxiv exploration. Later on in ffxiv its going to get harder and harder to get a good local of all the major places in the game. With this exploit you can now easily travel around the world and not worry about being attacked. This way you can test our new secret paths for getting around, find special areas to attack mobs that put you are near zero risk, and help make a major map of all the areas in the game and what mobs are around those areas.
Now lets get down to how this exploit is done. There is a few different ways people think this is being done. First of all a private server is running, but a private server for final fantasy xiv is very rare to have happened so far as it normally takes months to get a fully working private server up for a game.
The next suggestion is he is using some sort of hack that is injecting into the bet and making it so mobs cant detect him because of their radius, or he is editing his characters size for packets and making him so tiny for a radius that mobs cant see him.
The final way is he somehow found a spell or an item that is bugging the game and allow him to actually be cloaked or unseen by mobs. For example something that makes the ability of mobs to notice you at 50% and he is using it over and over again to exploit the abilities.
Either way this is a giant FF14 Invincibility Mob Exploit While Running in the game and if you want to learn more about ff14 exploits going on be sure to check out www.taultunleashed.com