The thri-kreen primarily fought with two types of weapons unique to their kind: the gythka, a double-ended, crescent-headed polearm; and the chatkcha, a crystalline throwing wedge. With four arms, a … Thri-kreen have insectile features and two pairs of arms. Their bodies are encased in protective chitin. They can alter the coloration of this carapace to blend in with their natural surroundings. Although thri … Human-Robot Interaction (THRI) Research at the intersection of robotics, human-computer interaction, artificial intelligence, haptics, and natural language processing . Thri-kreen often wear harnesses and even some forms of clothing, but they never wear armor. The two subspecies of thri-kreen found in the Tyr Region are the jeral and the to'ksa. ACM Transactions on Human-Robot Interaction (THRI) is an Open Access journal that aims to be the leading peer-reviewed interdisciplinary journal of human-robot interaction. He was the second child of Theodore and Martha Bulloch ….