Samhain, for your own islands.
Neep lanterns, corpse lights, a witch's cauldron, skulls, Celtic crosses and wandering ghosts. Ask ChatGPT or Claude for a haunted island, and Onceval builds it.
- Creator access, no invitation needed.Create islands at once, even while Onceval is in early testing.
- 3 more saved-island slots.The Free plan keeps 4 islands instead of 1; deleting an island frees its slot.
- Neeps, ghosts, a cauldron, haunted chapels and more,for your islands, inside Onceval: nothing to download. Yours to keep.
On your account page: sign in with your email, then pay securely with Stripe.
Everything a Samhain night needs.
Neep lanterns
Turnips carved with faces, the Hebridean jack-o'-lantern. Their faces glow once lit.
Corpse lights
Green flames that hang in the air where no one carries them.
The cauldron
Iron, on three legs over a fire; its brew glows green.
Skulls and Celtic crosses
Ringed crosses and old skulls for kirkyards, waysides and caves.
Ghosts
They drift, come and go, and fade as your light comes near.
Haunted chapels
A haunted chapel or kirkyard comes with neeps, a corpse light, skulls, crosses and its ghosts.
The Samhain look
Burnt-orange bracken, bare trees, a purple night and a low haar.
Samhain story beats
The Samhain fire, neeps at the doors, the dumb supper, souls led home.
Ask for a haunted island. Onceval builds it.
Get the pack
Sign in on onceval.com and add the Halloween pack from your account. It stays with your account.
Ask your assistant
In ChatGPT or Claude, with Onceval connected:
Make my island haunted for Samhain: neeps at the doors, a cauldron by the cottage and a ghost in the kirkyard.
Play and share
Onceval rebuilds the island and checks the story still plays. Anyone you share it with can play it, no pack needed.
What you need to use it.
An assistant
A ChatGPT or Claude account that can add a custom connector. Your assistant's own plan is separate from Onceval.
A one-time connection
Add Onceval to your assistant once, and sign in with the email you buy with. How to connect, step by step.
A recent browser
Islands play in a current desktop Chrome, Edge or Safari (WebGPU). Phones vary.
Do my players need the pack?
No. Islands made with it play for everyone you share them with.
Does it work on islands I already made?
Yes. Ask your assistant to change one: the island is rebuilt with the pack's pieces and its story is checked again.
Is it a subscription?
No. You pay once and it stays on your account. It is content inside Onceval for your islands: there are no files to download.
What are the 3 more islands?
Three more saved-island slots: on the Free plan you keep 4 islands instead of 1. Deleting an island frees its slot. Your daily changes stay the same (20 a day on the Free plan).
Do I need an invitation?
No. The pack includes creator access: once you have it, you can create islands at once, even while Onceval is in early testing.