Travel to Marae Lassel, visit the city of Ahurenga, and speak to the Hea.

Hea Nyrinua the Armorer tells you, "I would not bother traveling up to the highlands if I were you--it is dangerous there and populated only by timid, unimaginative folk. I've even heard that bukha Aun Ralirea has been spotted stalking the Ebon Gromnies among the plateau's peaks. Every year he stocks his lodge, expecting company...Aun just don't know when to let go."

Hmmm. Now, find Hea Arantah (47.1N, 90.3W).

Young Arantah looks annoyed - which seems to be his natural state.
Hea Arantah tells you, "What? Can't you see I'm busy? I have many responsibilities here!"
Hea Arantah tells you, "That Aun hunter, for one. What's his name?"
Arantah belches loudly as Nyrinua calls over, "Ralirea, my Tah."
Hea Arantah tells you, "Ralirea, yes. Don't CORRECT me, Nyri."
Hea Arantah tells you, "Anyway, this old Aun dustongue - Ralirea - poaches the gromnies of my plateau! If someone would kill him, and bring me that figurine he wears within a day as proof..."

So. All you have to do is to find Aun Ralirea the poacher, kill him, get the figurine, and return!

This is not easy ... at least finding Aun Ralirea is not easy. He is said to inhabit the Marescent Plateau, so head for the Marescent Plateau portal. Once on the plateau, start hunting. Perhaps you will find him near a gromnie spawn ... Eventually you find Ralirea, and kill him. Loot his corpse for the figurine.

In addition to the figurine, Ralirea drops an Ebon Spine Harpoon (Spear), and Ebon Spine Harpoons (Thrown Weapons). The Ebon Spine Harpoon does 5-12 Slashing/Cold damage; the thrown harpoons do 23-45 slashing damage.

When you return to Hea Arantah in Ahurenga and give him the figurine, ...

Hea Arantah tells you, "You're [your name inserted here]! They told me what you did - you killed that poacher Ralirea! Give me his figurine. Quickly, quickly!"
You give Hea Arantah Clay Figurine.
Hea Arantah tells you, "Wow, great! Ha ha! I warned them not to send their hunters on to my plateau!"
Young Arantah clutches his fist around the little figurine, so tightly the veins in his wrist stand in relief. His eyes flash violet, and after a muffled crunch, clay dust begins to trickle through his fingers. He looks up at you and grins boyishly.
Hea Arantah tells you, "That was a trick my friends taught me, way back when I was driven from Timaru. I could do the same to your head, you know."
Hea Arantah tells you, "I'm kidding! You've been a friend the Hea, and I reward my friends. Here..."
Arantah places his hand on your forehead and his eyes glow blue-white. You feel... enlightened...

You have gained a skill point!

Of course, this only works once for any character. If you kill Ralirea again and try to get another skill point:

You give Hea Arantah Clay Figurine.
A suspicious scowl lumbers across the young Tumerok chieftain's face.
Hea Arantah tells you, "Now wait. My memory isn't what it used to be since the atual arutoa... bettered me, but I do remember your face, [your name]."
Hea Arantah tells you, "Yes... I rewarded you for Ralirea's death before. That means this figurine must be a fake! You dare try to fool the mighty friend of the atual? Go away before I use my Grip on you!"