The complete building update is included in version 0.0.3, released 18 October 2026. Holding foundations are separate from ordinary improvement slots and the duchy-capital slot. The implemented races share native base castle, city, temple and tribal mechanics; racial artwork and research requirements remain distinct.

An upgrade replaces the previous primary building. The table shows base direct effects before culture, faith, government and other conditional bonuses. Costs are per step, before discounts. A listed later tier still requires its research and normal construction conditions; a later era date alone does not unlock it.

These effects are additional to the base tables above and apply only while their conditions hold. Values are totals for that foundation tier. Culture means the county culture unless explicitly stated as the owner culture. Coastal means the holding itself is coastal. Bonuses with different conditions can apply together. A condition belonging to a native tradition or government is not automatically granted to a race.

Each row gives alternative discoveries accepted by that research gate. A racial alternative requires that matching culture; the native alternative is accepted for non-Orog cultures. Castle and city research is checked on the county culture; temple research is checked on the holder culture. Upgrades also require the preceding foundation.

Tradition exceptions: Republican Legacy or Parochialism permits City II without its normal gate, City III with the City II gate, and City IV with the City III gate. Religious Patronage permits Temple I without its normal gate and Temple II–IV with the previous temple tier’s gate. These exceptions do not bypass the preceding building.

Government and placement: New castle/city/temple construction must pass the normal empty-barony holding checks. Later castle/city/temple levels require the nontribal construction check; temples additionally exclude Mandala holders. Castles also retain native Japanese castle-construction restrictions where relevant. Tribal I cannot be newly constructed, Tribal II has no research gate, and tribal foundations require tribal eligibility to remain enabled.

Use the culture's ordinary-building and research guides for the actual unlocks. The shared 14 foundation levels do not add unimplemented human later-tier infrastructure. Racial ordinary buildings remain separate slot investments. Source holdings use their own primary chain and are not generic temples. Tribal and other government conditions continue to apply.

The holding foundations retain native costs and combat/economic effects; their racial appearance does not provide an additional hidden racial bonus.

Complete building catalogue · Research and buildings

Castle, town and temple foundations now grant their direct blooded holder +0.10/+0.20/+0.30/+0.50 RP per month at levels I–IV. Upgrades replace the previous tier; vassal holdings do not pass RP to their liege. Occupation suspends income. The bloodline storage cap applies. See holding Regency and the four-level Source guide.

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Planned for version 0.1.0.

Monthly Regency · Sources · Holding upgrades · Research alternatives

Castle / Town / Temple / Source

Castles, towns and temples pay their direct blooded holder, regardless of class or culture. Vassal holdings do not pay their liege. Occupied holdings pay nothing. Income updates monthly and respects bloodline storage capacity; settlement income has no additional cap.

Sources have four playable levels. They require a landed, blooded Arcane holder with an initialized bloodline score for RP. Their six support chains also have four levels and require the matching primary level. Source income alone retains its shared 4 RP/month cap; Chambers multiply local base RP before that cap. No gold or levies. No realm spells or ley lines.

The separate annual payment rolls 1 or 2 RP with equal probability, for both player and AI blooded characters. Storage capacity still applies. Hunt and feast rewards keep their existing rules.