Changes

4 - You are first going to want to enable EASY mode and travel to to Costlemark Tower - (http://bit.ly/2gPFtuM). Complete the dungeon up until reaching the very bottom puzzle section. The point of using easy mode is simple - you can't die and it allows you to easily cheese a majority of the fights including your EXP farm on the bottom level. You will find an item called the Moogle Charm along the way - This will increase any characters EXP who have the item equipped - give it to whoever is underleveled. The Moogle Charm also drops in other higher level dungeons like Crestholm Channels and perhaps one more. Basically I had 1 charm per party member eventually. Continue down through the dungeon till you reach the bottom puzzle. Activate all of the puzzle levels as if you were going to complete the dungeon, but on the 3rd or 4th descent below do not go through the route that would lead you to the boss (that would be the path with the circle in front of the path selection). Meaning - you will continue to choose the wrong path each time thus leading you not to the boss but to a trapped pit with 3 Fire Demons, 1 Naga, and many small enemies. The puzzle will drop you below into a long hallway. The idea is to run out of the hallway to spawn the monsters (starting the fight) and then run back in. You will be completely safe in this hallway and the monsters will not be able to harm you. You now have 2 options - 1. Complete this excruciating long fight repeatedly to gain exp or 2. Wait a few minutes for the L2 Astral theme song to play and 1 shot everything giving you over 15,000-20,000 EXP per clear. I basically netflix’d and chilled till the Astral music came on, then proceeded to 1 shot everything. If you are having a hard time triggering your L2 try letting Noctis and the party get kicked around a bit. You won’t be able to die because of EASY mode and even if the party wipes they’ll all still get EXP! After, take the elevator up and repeat the same path, you should be able to grind out a few hundred thousand EXP per hour. I realize this sounds quite complex but after doing it once you'll see how simple it really is. MOST IMPORTANT - This method appears to net many coin drops to repeat the above Step 1 (Expericast Spells). Ideally you want to be in the realm of 800-900k EXP if you are sub level 50 before traveling to to Altissia to sleep at the 3.0x hotel (if you want to cap at 99). The coins and ability to 1 shot everything made this a very attractive EXP farm for me - but you may prefer something more hands on.