Here’s a description of Khalar Singh from an early character breakdown that leaked online some time ago:
He’s in his 40s to 50s, Asian or Middle Eastern, Central Asian, Mongol, Turkish, or Persian, open to all ethnicities; commanding in size and manner, a warlord and formidable warrior, brilliant, cruel, weathered and tanned by the many campaigns he has waged and won. He is driven in his quest to find the Queen of Acheron and has been building an empire to do so. His goal is to find the Queen whose blood will bring life to the demonic minions of Acheron while making himself king of this hellish power. With this power, Khalar will protect his legacy against the onslaught of master sorcerer, Thoth-Amon so that his weak son, Fariq may rule after his death. While riding into a Cimmerian village to recruit his old comrade, Corin, his large collection of mercenaries slaughters them to the last soul when Corin refuses to join them. The village’s only survivor was young Conan. When Khalar’s search has finally narrowed to the likely discovery of the queen at a monastery of female monks, he also learns Conan is older and hungry for revenge
I can definitely imagine Stephen Lang as an evil warlord! Glad he will be on board this new Conan movie, he’s a great actor to pit against Jason Momoa who’s playing the role of Conan.