In an age of sail, one of the most important of resources is a source of tall, straight and strong trees for use as masts. Mastwood island is one such location.
In order to understand what a Kitsinger island is, you must first understand the people that used to live on Mt. Kitsinger. This is not only a tale of their history but a tale of their making.
Ever since the two major religions of Acqua, that of Jove and Ulmania, were created, their clergy have hated each other with a passion that at times has led to violence. Mostly it just means that they do everyrhing differently out of spite.They have different liturgical uses, different hymms and prayers, different baptism,wedding and funeral services. The priests of Jove favour cremation for the dead in nearly all cases, so the priests and priestesses of Ulmania favour burial.
Where there is enough space this is not a problem, but in crowded Banhoesea it became a major issue.The bodies of Ulamanian worshippers were being buried secretly in the floors and foundations of houses or in soon to be dug up land or in crop fields.After a major outbreak of disease the De Madden Company Central Council, of which all but one worshipped Jove, threatened to outlaw the Ulmanian religion, persecute it’s beleavers and confiscate it’s assets.
The great majority of Sea Witches and a few Sea Wizards were Ulmanian beleavers and called a nationwide strike, trapping half the De Madden Company fleet in harbour.Without magic most could not leave harbour safely and even the ten masters would take a long time to get anywhere.
The Central Council got really angry and arrested the strike leaders, threatening to hang them. The strikers threatened to use their magic to cause huge waves within the harbours and wreck the ships within.A compromise was reached.The strike leaders were set free and Ulmania’s Church purchased a large,partly rocky, mile-long island, with a quarter of the Church’s wealth. This was to be their Isle of the Dead.
All burials outside it were banned with the threat of very severe punishment for those who disobeyed.
That was over seven hundered years ago…
If you want to add a "supernatural" touch to your campaign, define the rules of magic and the universe. Make your players comfortable with those rules. Then your new supernatural creatures must then break those rules.