Can sail (be attached) only to coastal realms. Only undead champions may pass Charon. Others need to pay the price - sacrifice a champion to attack that realm.

"Somewhere down the deepest lake, in the middle of the ocean, lies a place only undead ones can freely speak about. Surrounded by splashing waves and cold, dark waters, a huge boat is floating alongside the stream. Bleak lanterns could be seen, fighting against thick, misty air. Usually, you could see a black figure on the boat, too, rowing through untamed waters, quietly gliding into the night. More often than not, the boat isn't empty. Bodies of the fallen mortals take up the majority of the place, their limbs peek out against the darkness of the night, but the figure's expression remains the same. Many wonder what this sighting is, but locals know it's a Charon, a dead figure, ready to take any mortal souls into the unknown. Some tales say that if you see him, it's bad luck: you'll end up dead yourself soon enough. Others believe the opposite: he won't show himself to the already doomed ones. One way or another, Charon's grim work doesn't go unnoticed as many coastal realms use fear of the carrier of the death to scare away the intruders and the ones wishing bad. However, for undead ones, Charon causes no real threat: they could go to the land of the dead and come back, easily straddling the line between death and life. But be aware, any living creature once crossed that threshold will have to say goodbye to their life and forever stay on the other side, yearning for something that dead ones could never get."