1. If you want to obtain the perfect arcane essence, you want to go to the top of the gravel castle in the Tyroka Forest to find Sahis. It is located at the (44.41) on the map, and the specific location is shown in the figure below.

2. Arcane essence needs to be obtained from the Crystal Rager and Arcane Phantom in the Minerals.

3. Defeat an Arcane Phantom and you can get an Arcane Essence.

4. Defeat the Crystal Rager once and you can also get an Arcane Essence.