Nerve is two installable pieces: an extension you get through the Fantasy Grounds Forge, and a Windows companion you download here. You need both, at matching versions.

Before you download

This is alpha software. Setup and gameplay behaviour are still being tested, and provider and multiplayer coverage are uneven. Please read the known limitations and the privacy and data-flow page before installing — in particular, selected campaign context is sent to the external AI provider you choose, and that can include GM-only material.

Back up your campaign and start with a test copy. The setup guide walks the install in order.

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Windows companion downloads

Every release keeps its own permanent address. We never replace the bytes at an address that has already been published, so a checksum you noted last month still verifies, and an older companion stays installable for as long as anyone is on the extension that pairs with it.

Nerve 0.68.7 (alpha)

Current / recommended

A substantial alpha update focused on safer live play, lower accidental AI usage, clearer setup, and more reliable Fantasy Grounds event handling.

Release date

15 September 2026

Pairs with extension

Nerve Adapter v0.68.7

File

Nerve-Windows-Companion-0.68.7-alpha.zip

File size

1.23 MB

Download companion 0.68.7 (1.23 MB) Checksum (.sha256)

SHA-256 613b3004edb419cc4813389df2b1d8c87adbee578dad9978fd3cffb52ac2baba

What improved in this release

• Manual Work Mode — Make native Fantasy Grounds bookkeeping changes without generating automatic AI cues. Deliberate Call Nerve requests stay available.
• Version safety — The extension and companion now require an exact version match, and say which of the two needs updating.
• Cleaner rolls — Table results and staged skill, ability-check and saving-throw messages settle into one follow-up instead of duplicate paid cues.
• Safer combat flow — Attack and result stages settle together; completed native damage does not repeat or end the player's turn; remaining effect work stays available; and a final defeat preserves wounds, effects and roster entries until an explicit end-turn.
• Better continuity — A confirmed current-room Story context can survive combat and a session resume without repinning.
• Safer recovery — Stale decisions are rejected without duplicate actions, and a claimed provider or listener failure is closed out cleanly rather than resubmitted as another possibly billed request.
• Clearer controls and installation — Session and AI controls are easier to read, and the custom-app configuration launcher is now installed correctly.

Nerve 0.67.1 (alpha)

Previous version / rollback archive

The first publicly published companion, paired with the 0.67.1 Forge extension.

Check your adapter version first

Requires the matching 0.67.1 Fantasy Grounds extension. Do not mix versions.

Release date

11 September 2026

Pairs with extension

Nerve Adapter v0.67.1

File

Nerve-Windows-Companion-0.67.1-alpha.zip

File size

1.19 MB

Download companion 0.67.1 (1.19 MB) Checksum (.sha256)

SHA-256 23de585dbe9bb0fc48ca37a7ecb9246fb1c252cae14b3f2df349f8edbe2f48f9

Verifying what you downloaded

Every published ZIP ships with a matching .zip.sha256 file. Each digest is computed at build time from the exact bytes this site serves, so a published checksum and its published file cannot disagree. Verify before extracting — compare the output of the first row against the checksum on the card above:

Fantasy Grounds extension

Available on the Forge

Forge manages the extension and supplies the .ext file; you do not download it from this site. The companion below manages the local runtime. Both are free, and both are required.

Discussion and bug reports

The public Fantasy Grounds thread is the best place for questions other testers can answer, and for reporting problems in the open. Please redact personal information, credentials and private campaign material before posting, and keep support bundles out of public posts — send those privately if we ask for one.

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Two pieces, two update paths

These update separately, and mismatched versions are a common source of odd behaviour.

Current packaging targets Forge Data installation, not encrypted Vault delivery. Versions must match the release instructions — check release notes before updating one half without the other.

Rolling back

Every release listed above keeps its own permanent, versioned address, so rolling back is just installing the older companion and the extension version that pairs with it. We never replace the bytes at an address that has already been published — a new build always gets a new address — so a link or a checksum you saved months ago still resolves to the same file. Per-release known issues and update instructions are on the releases page.

Downloads are served over HTTPS from studio-controlled storage. Fantasy Grounds and the Forge are operated by SmiteWorks, which has not endorsed or certified this product.