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Locked schematics should be placed in locked folder inside the schematics folder. The path would look like this: <instance>/schematics/locked/<schematic name>.nbt.
Then, to unlock the schematic you would use the command this mod adds:
Knowledgeable folks may have already guessed how this works. Yes, it just copies the file from one folder to another.
Unlocks the schematic on quest completion:
onEvent('ftbquests.completed', event => {
event.server.runCommandSilent(`execute at ${event.player.id} as ${event.player.id} run schematic unlock pillar`)
})
Create is not required as a dependency. But, obviously, mod is pointless without it.
Feel free to suggest a feature, if you need it for your modpack.