A Parade of Black
This is an oath sworn by your Honor. Honor is of core importance to every intelligent being on the realm. Acting with enough Honor gains you privileges above others and acting without it…well, sooner or later everyone gets what's coming. Breaking your word results in immediate loss of Honor form a mere tap of 10% to 75%(PHB 86 5B), close to an Honor Purge.
Better not to do it if you can at all avoid it.