Do this once you have gotten the Abyssal Armor and War's Glory Legendary equipment.
Go to Ashland northern map and there is a single round wooden structure that has a hole in the middle. Jump down inside 10x or until the Playstation console lags or noticed the frame rate drop every time you climb out of the hole.
Then look to the south of this round wooden structure and you'll notice that the Horseman has respawned countless times. This is because of jumping in the wooden structure hole repeatedly.
Run towards them head-on and clockwise until they start to follow you around.
Once you have gathered everyone, you will need to proceed north and there will be a cavern beside the mountain.
Once inside, just jump out of Ruin (your horse) equip your scythe, and then jump towards the enemy while pressing the ATTACK button. You will repeat this movement (Jumping and pressing the attach button) to hit the enemies multiple times.
This will rack up an enormous amount of combos using this jump and attack combination.
To level up the Tremor Gauntlet you will need to stay up the ledge on where you jump from Ruin (Your horse). Get close to the ledge but do not fall over down. Just stay on the ledge and just press the R1 + Triangle to do the Earthbreaker moves. This will rack up a large number of combos as well.