Troyes
Which dice does Le Roy spend, and does colour matter?
The solo rules describe the ordering, and several players confirm the colour-blind spending.
He spends his best dice first and ignores colour and value except for ordering them (red, then yellow, then white on ties). For an action costing several dice he uses that many of his best, so a Cathedral placement may use non-white dice. When fighting a black die he uses only his single strongest die against the highest black die and passes the rest back to you.