Motte and Bailey (2,000) - Grants +5 siege defence and +3 to levy rolls in the province it is constructed in. Takes 1 week to construct.
Stone Keep (3,000 upgrade) - Grants +7 siege defence and +4 to levy rolls in the province it is constructed in, as well as +50% garrison size. Takes 1 week to construct and requires a Motte and Bailey for upgrade.
Stone Wall (5,000 upgrade) - Grants +10 siege defence and +5 to levy rolls in the province it is constructed in, as well as +1 Demesne limit. Takes 1 week to construct and requires a Stone Keep for upgrade.
The above defensive & levy bonuses are not stackable, and can only be used from one upgrade.
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