Mavishan Cube
Wondrous Item,
Very Rare
(cost 50000 gp)
Crafting Components
A shipwreck where at least seven crew members drowned and sank to the bottom of the ocean.
This radiant, azure cube crafted of planarite of space-aspected Mavisha can be consumed as part of a one-hour ritual to create a ship-spirit, which usually is as powerful as a Challenge 10 creature. Please see the bestiary entry on ship-spirits for more details.
Source