The Demon of Yiddaqqua

No scholar knew the origin of the strange demon that lurked the ruined city of Yiidaqqua and no sorcerer knew the true name that might bind or banish it. But the demon rarely showed itself in an angry mood and would sometimes converse with travellers who took shelter in the crumbling palaces of that once great city, telling tales of heroic warrior-kings who vanquished monsters and treacherous sorcerers.
The demon often spoke of a great treasure in the catacombs beneath Yiidaqqua and graciously offered to lead many a traveller to the hidden trove. But strangely none who searched for these riches ever returned.
 (From the Scrolls of Druuna-Cosan)

Spawn of the Windwalker

 
I am the howling wind of fear.
I am the frost that brings starvation.
Who calls me with the words older than mankind?
Ia IT-AH-Qwa
Ia Shatukk ng'liu
Ia Ki-Nah-uk
Ia IT-AH-Qwa
Who calls me with an offering of flesh?
I am the Wind-Walker.
The frozen dead follow in my footsteps. They come to devour the living.

(Inscription from a menhir discovered on Ellesmere Island, translated from the Aklo by Professor Ben Crawford)

Necronomicon pages referencing human sacrifices made to the Spawn of the Windwalker by primitive tribes

Windwalker cult artifact in Miskatonic collection