How do I get this?

1. Buy any trade pack from a trade manager. What it is doesn't matter. Just throw it on your horse.

2. Go look for Red Thief icons on the map. These are the bandits that spawn when you have a trade good on your horse or person and start attacking you. They're around 50-55. They deal pretty decent damage. However they are 100% able to be chained CC forever.

3. Kill said thieves. They died pretty fast when I did this at 173 AP/193 DP. As a melee I found if I stayed on the Archer the melee came to me and died in a nice pile. They drop 0-3 seals and it's RNG drops.

4. Their respawn time isn't bad. By time I had cleared out north Calpheon and was towards Veilia the North Calpheon ones had respawned.

Theifs are lvl 50 and they are pretty tough to kill at "medium" gear
I got 92/138 and it take me 20-40seconds to kill one group