Permanently unlocks the Rock island theme on your account. Once it is yours, you can choose Rock whenever you create a new HomeWorld island, or re-theme an island you already own — any island can be re-themed once every 24 hours. The unlock itself never expires, and clanmates building on your world can pick it too.
What it changes: the island is rebuilt as a hard country of bare stone shelves and shattered crags, built around a weathered Ruin, with a Tyranitar statue standing in it. Terrain, plant life, water, weather and ambience all change with the theme. Re-theming keeps your builds and everything stored on the island — they are lifted clear and set back down on the new ground.
This is a one-time unlock. You only ever need one — a second copy of the same theme adds nothing, so please don't buy it twice. Delivered in-game within moments of purchase.