How do I complete A Head for Business?

Bring Troll Head to Skrizzik; Forgotten item: Troll Head

What are the rewards for A Head for Business?

Experience: 6,000; Gold: 3,500; Guaranteed: Adrenaline Overdose × 5; Choose one: Tripple Biosteroids Shot × 5 / Magic Bomb × 5

Take the Troll Rusty head to Skrizzik on Prison Island. He might have a use for it.

Take the Troll Rusty head to Skrizzik on Prison Island. He might have a use for it.

Notes

Take the decapitated head to Skrizzik on Prison Island.

NPC

You brought Skrizzik a Troll head?

NPC

Skrizzik knows there are rituals that could get you a mount.

NPC

Skrizzik would help if we do ritual here.

NPC

Of course, Skrizzik doesn't know how to do it exactly, but Skrizzik knows where you could start.