A sci-fi sandbox in development by Casilian Studios

Grevara

Your ship. Your crew.
An untold galaxy.

Build a ship block by block. Lead people who carry their experience with them. Explore a vast galaxy where the systems aboard your ship and the world beyond it are meant to connect.

Original concept illustration · Not gameplay footage

THE PROJECT

3D science-fiction sandbox · In development

THE FIRST FOCUS

Single-player · Windows and Steam planned

THE HORIZON

Procedural galaxy · Handcrafted discoveries

01 / The experience

A ship is more
than a vehicle.

Grevara’s vision starts with a ship you can build and inhabit. Its hull, rooms, crew, and internal systems are intended to be part of the same experience, rather than separate modes that never affect one another.

Construction changes how you live aboard. Damage changes what the ship can do. The people you delegate to shape how problems are handled. Exploration gives those choices somewhere to lead.

Read the gameplay vision

The larger goal is a sandbox where you can move between personal-scale decisions and the wider galaxy: build, fly, explore, command, recover, and return. First-person and third-person ship flight are part of that intended experience.

This is a project in development. The pages describe both the design vision and the smaller engineering prototypes currently used to prove it. The development snapshot makes that distinction explicit.

Read the current status

02 / Connected play

Build. Fly. Lead. Explore.

01

Build

Shape a modular ship and its interior, with a purpose for the space you create.

02

Fly

Take that ship into a 3D space sandbox, with first- and third-person flight planned.

03

Lead

Delegate work to a crew whose memory and relationships contribute to continuity.

04

Explore

Find your path through procedural scale and authored content, mysteries, and histories.

03 / Go deeper

The details that
make a world.

Construction & ship operations

Build something worth keeping

Explore modular hulls, interiors, interconnected utilities, damage, and the intended finite-parts repair loop.

Ships & systems

Crew & command

People aboard your ship

Understand persistent memory, bounded learning, relationships, jobs, delegation, and the role of MDV voices.

Meet the crew vision

Exploration & scale

Beyond the known

Read how a procedural galaxy, handcrafted discoveries, factions, economies, and history fit into the wider ambition.

Explore the universe

04 / Current development

A smaller experience.
A stronger foundation.

Updated 12 October 2026. Software-tested foundations and native player-facing acceptance are tracked separately.

Captain Who Remembers · Engineering prototype

The crew comes first.

The current prototype brings together 30 crew members, five existing host tiers, memory, delegation, and persisted continuation. Recent work has advanced checkpoint controls, bounded relationship learning, and presentation reliability.

The next challenge is integration: a credible ship emergency, repairs with limited parts, connected utilities, and continuity that survives leaving and returning.

05 / Technology

Ambition with
scalability in mind.

Grevara is being built on Maple Engine, Casilian’s custom C++ and Willow foundation. The design aims to vary simulation and presentation detail according to context, so a large world does not require every place to run at the same level of detail all the time.

Seven simulation/detail levels are the finished design target. Five host tiers exist in the current prototype. Five tiers describe the current crew prototype. Seven simulation/detail levels remain the broader design target.

Support for lower-end hardware is a goal. It is not a published minimum specification or a guarantee for every machine. Windows device behavior, audible playback, and Vulkan rendering still require native verification for current changes.

Technology & performance

Modding is part of the longer-term vision. Specific modding interfaces, compatibility, and distribution details have not been announced.

06 / Common questions

A few things
worth knowing.

Can I play Grevara today?

Grevara is in development. This site does not announce a public game download or playable release. The Captain engineering prototype is a development foundation, not the full sandbox.

Which platforms are planned?

Windows and Steam are planned. There is no release date or public Steam store link announced on this site.

Will there be multiplayer?

Single-player is the first focus. Multiplayer is a later goal after the single-player foundation, rather than a currently available feature.

Are the crew powered by an LLM?

The NPC vision uses non-LLM memory, learning, relationships, jobs, and delegation. Current work demonstrates bounded mechanisms in the Captain prototype; it does not establish the entire social world as complete.

Where can I find detailed development progress?

The Where We Are page is a dated snapshot that distinguishes established prototype systems, software-tested changes, remaining native verification, the next integrated slice, and the longer-term vision.

For studio and product inquiries, email contact@casilian.com.