What is Castle Block used for in Enshrouded?

Castle Block is not used as a crafting ingredient in any recipe.

BuildTools

Enshrouded Castle Block

Item details

Castle Block is a buildtools item (tier 6) in Enshrouded. It is crafted via Castle Block.

“Only a prestigious castle can be built from such sturdy stone.”

Workbench

Recipe	Makes	Station	Raw materials
Castle Block	100	Workbench	2

Extracted from the Enshrouded game files.
Field	Value
`maxStackSize`	5000
`rarity`	Common
`category`	BuildTools
`ammunitionType`	Invalid
`itemClassAlignment`	None
`generateRarity`	false
`comfortSetup.comfortAmount`	0
`damageSetup.speedMod`	1
`damageSetup.dmgMod`	1
`damageSetup.distribution.physicalCutDamage`	0
`damageSetup.distribution.physicalPierceDamage`	0
`damageSetup.distribution.physicalBluntDamage`	0
`damageSetup.distribution.magicalFireDamage`	0
`damageSetup.distribution.magicalIceDamage`	0
`damageSetup.distribution.magicalFogDamage`	0
`damageSetup.distribution.magicalLightningDamage`	0
`damageSetup.distribution.healing`	0
`damageSetup.distribution.poisonDamage`	0
`damageSetup.distribution.woodDamage`	0
`damageSetup.distribution.stoneDamage`	0
`damageSetup.distribution.metalDamage`	0
`damageSetup.distribution.explosionDamage`	0
`armorSetup.distribution.physical`	0
`armorSetup.distribution.blunt`	0
`armorSetup.distribution.pierce`	0
`armorSetup.distribution.cut`	0
`armorSetup.distribution.magical`	0
`armorSetup.distribution.fire`	0
`armorSetup.distribution.ice`	0
`armorSetup.distribution.fog`	0
`armorSetup.distribution.lightning`	0
`blockSetup.quality`	0
`fuelSetup.burnTime.value`	0
`fuelSetup.energyOutput`	0
`itemLevelRange.minLevel`	0
`itemLevelRange.maxLevel`	0
`growthInfo.submergedRequirementMin`	0
`growthInfo.submergedRequirementMax`	0
`randomLootStackRange.minStackSize`	200
`randomLootStackRange.maxStackSize`	300

What is Castle Block used for in Enshrouded?: Castle Block is not used as a crafting ingredient in any recipe.
How do you get Castle Block?: Workbench