In the 14th Void Sovereign's domain, the deeper meaning of the Lighthouse of Hope was the concept of a shore that could never be reached. Hope was precious because it couldn't be reached.
Therefore, unless one had the soul imprint of the owner of this place, no one could cross the Sea of Despair to reach here.
This was also why Valk told William that the Father of the Crows' soul fragment was a circus ticket.
The four Void Sovereigns who had placed their bets on Coles followed the mark he left behind into the tower. They transformed into their appearances as believers and sat on stone chairs, looking around the surrounding round table hall with interest.
"I thought that you had completely absorbed his remaining power before we came in… Are you still not used to betrayal? Or do you need our help?"
