I know that there have been some posts already about mistkeeper or alchemy for colorblind. I wanted to post again in relation to this boss as well.
I think if you add a symbol to each of the 4 pillars and then add a symbol above the boss that matches when the shield is up (similar to maybe the honor points symbol?) it would help.
Similar with alchemy, if there is a skin of a symbol over the pot depending on the color, it would help.
Others in the party can yell out which pillar to go to but it would be nice.