Oathguard - The Sacred Macuahuitl

"Oathguard, they named it, though none dared wield it lightly. The runes etched along its length were not carved by mortal hands, but seemed to grow, twisting and shifting as if alive. And there was a warmth to it, subtle and strange, like the breath of a sleeping beast. Yara claimed it had been a gift, though she spoke little of how she came to possess it."