In the basic game, what are Black Shields used for?
Best I can figure, is that they are a 'nothing', ensuring the desired ratio of shields to skulls.
But I wondered if they have any offical use, either in the main game or one of the expansions? Not had time to read them all yet - nor, to be honest, the main rules hugely thoroughly. My inital quick-read through didn't spot anything, and am feeling lazy and impatient...
Thanks!