So i came up with 2 skull ideas that are cursed (just like the cursed chests in 'gold hoarders').
Skull of summoning: Having this skull on board makes your ship a battlefield. If you're not looking at the skull often enough, it'll start rising bones from the bottom of your ship. Eventually these bones form skeletons to attack you while on your boat. This skull is very fragile if exposed to sun/moonlight. So it has to be belowdeck. or it will go black, and reduce it's worth by 75%. When the skull is in reach of sun/moonlight it's eyes faintly glow blue. indicating you need to move it belowdeck.
Skull of Beaconing: This skull makes your ship brightly flash green every 60 seconds. Revealing your position to other pirates (if they're not blind). This will propably get some pirates on your tail, wanting a piece of your treasure. The skull starts out grey with one golden eye. In this state it has the worth of a villainous skull (900-1400) The longer you keep it on your ship, the more of the skull turns gold. When it's fully gold, your ship will keep glowing green without a pause (less bright to prevent your crew from being blind). In this state the skull is worth 2000-4000 gold (like a stronghold skull). worth in gold and reputation both increase over time. The skull emits an increasingly loud whispering roar starting 5 seconds before the beacon flash.
