Path to the Dark Wizard

1 Seed of Lunacy

Talk to Witch Varika at the Altar of Rites. Then speak with Arkenia (standing next to her). She gives you a Hub Scent and tasks you with hunting Scout Skeletons.

Go to the Ruins of Agony near Gludio and collect 3 Hearts of Lunacy. Return to Arkenia to receive the Seed of Lunacy.

2 Seed of Horror

Find Annika at the entrance of the School of Dark Arts. She gives you a candle and sends you inside to hunt skeletons (Skeleton Hunters, Archers, or Misery Skeletons).

Collect 2 Knee Bones from the first few rooms and return to Annika to receive the Seed of Horror.

3 Seed of Anger

Locate Charkeren near the Undine Waterfall. After hearing his story, head to the Swampland to hunt Marsh Zombies.

Collect 3 Family Remains and return to Charkeren to receive the Seed of Anger.

4 The Final Seed

Return to the Altar of Rites. Talk to Arkenia to get the last seed, then give all 4 seeds to Varika to receive the Jewel of Darkness.