Indigo

Indigo blood, sometimes referred to as Blue, is considered the fourth highest class on the hemospectrum, sitting between Cerulean and Purple. Indigo bloods get a +GRT/-RAS bonus.

Background
Oh, so you think you know about the greatest caste? The purveyors of fine taste and civility in a galaxy of ruffians and nuvo riche upstarts? No, allow me to inform you, as I know far better. Indigo bloods ARE culture, full stop, and as the culture they obviously need to keep it out of the hands of foolish lowbies and other, less fancy highbloods. As heads of organizations, owners of businesses, STRONG arms of gentrification, and patrons of the arts, indigos are the boss. They're renowned for their WEALTH and POWER, but also their STRENGTH; the most famous athletes on the planet are Indigos, and they perform in Muscular Theatre, Kaijuball, and other sweaty sports like it's NOTHING. You should listen to them. You kind of have to. They'll call your manager if you don't. Or the drones. - Subgrubs & Snazzards, pg. 115