Habolg  

Habo, ハボルグ

Habolg is a renowned Black whistle who delivered Lyzas White Whistle and final notes to the surface. He is known as Habo-san by Riko and other children. One of the delvers sent after Riko and Regu, he caught up quickly and respected Supreme Treasure of the Netherworld, Regu, due to Natt and Shiggy's insistence. Instead of taking them back to Orth, he offered to escort them to the Seeker Camp. He then gave Riko a warning about Ozen, provided some medicine and supplies, and allowed them to go. Since then, Habolg has been seen on the surface telling stories to Nat and Shiggy about the abyss and its inhabitants, offering foreshadowing of the dangers that Regu and Riko will face.