Unlike the Ecliptic and Spacer legendary ships, the Va'ruun Shroudbearer legendary ship encounter doesn't seem to start properly. The Va'ruun ships will not warn the player away, they do not turn hostile if you keep approaching, and the quest to destroy the legendary ship doesn't appear in the quest log, unlike the other two legendary ships. The player can still manually attack the ship to make it hostile, and destroy it, but I'm unsure if its actually progressing the quest behind the scenes at all.