Yakat

From publisher blurb:

SILENT FIGHTERS

Often seen as quiet, aloof, and at times dangerous, Yakat are large insectoid people hailing from planet Xagroph. They possess elaborately beautiful outer carapaces which come in a rainbow of colors that change with mood or choice as youth but solidify to a single color at adulthood. After years of wars between their people, they are often industrious and tactical but also at times violent, overbearing, and warmongering to those not privy to their voracious nature. This is reflected by their love of sparring with just about anyone they come to meet. Challenging and succeeding in combat is the quickest way to earn friendship and respect among many Yakat.