MythicLemon - Open World Builder Bundle

Everything you need to build large, believable worlds in Unreal Engine 5. Sculpt with stamps, colour terrain with art-directed materials, generate buildings from a floorplan, and start from 43 ready-made landscapes.


What's inside


Landstamp Pro
  • 300+ professional heightmap stamps
  • Stamp any texture or 3D mesh straight into a landscape
  • Canyons, mountain ranges, river channels, impact craters, rolling hills and volcanic calderas


AutoLandscapePro
  • Builds a complete, art-directed landscape material inside the editor — colours, gradients, elevation bands, your own textures and weather — and pushes it onto your live terrain
  • 133 ready-made looks across 14 categories: pick one, click apply, done
  • 100+ royalty-free gradients you can ship in any project
  • Optional Design with AI using your own Anthropic, OpenAI or Google key, or a local Ollama model


Keystone — Modular Building Generator
  • Draw the floorplan and Keystone generates the building
  • Eight one-click starter presets, from House and Gable Cottage to a 3-Storey Block
  • Sketch footprints on a true-to-scale 2D canvas, or load a floor-plan image
  • Multi-volume composition for castles, towers, gatehouses and wings
  • Bakes to Nanite static meshes with collision; import/export designs as JSON


Massive Open World Landscape Pack
  • 14 open-world heightmaps at 1K, 2K, 4K and 8K
  • Textured, lit demo maps for every landscape
  • Bonus AutoMaterial, PDF setup guide and Gaea source files


Fantasy Landscape Pack
  • 15 fantasy heightmaps from 512 to 4K, with 8K versions of the open-world maps
  • Demo maps, AutoMaterial and a PDF setup guide
  • Gaea source files for editing the terrain


Mythic Relic Landscape Pack
  • 14 heightmaps with dark fantasy landmarks carved into the terrain itself, such as Hand of the God Isles and Island of Forgotten Tomes
  • Demo maps, AutoMaterial and a PDF setup guide
  • Gaea source files included


Who it's for

Level designers, environment artists and solo developers who want to go from an empty level to a populated open world fast. Start from a finished map, reshape it with stamps, restyle it in AutoLandscapePro and drop in generated buildings.


Good to know

  • Each product is delivered to your Fab library as its own listing, with its own documentation, updates and support from MythicLemon.
  • Fab doesn't adjust bundle prices for products you already own, so check the list above before buying.
  • Questions? Ask on the forum thread linked from this page.