Games like Rust involve spawning on an island with nothing and building upward to survive raids from other players.
Developers can use the Terrain Draw Tool to generate spheres of land and shape them into custom island environments. Epic Games - Fortnite Developer Program rising-island-game-link
If you are looking to create a write-up for a game with this theme, here are three distinct ways the "rising island" concept is currently being used in the industry: 1. The Procedural Indie Devlog Games like Rust involve spawning on an island
Reworked save systems often focus on "island-specific data" to allow players to switch between multiple rising landmasses. rising-island-game-link