Forty custom studies across the four shared eras. These are authored mod names and effects, not quoted Birthright technologies. See the overview.

Starting discoveries: Herd Keeping and Practical Ore Working. Every other custom study must be researched. Era dates are the earliest entry dates; reaching the year alone does not grant discoveries or building upgrades.

Read the tables: Civic studies develop the economy and assemblies. Military studies develop musters, equipment, wolf riding, defenses and siege engines. Every ordinary building pair also needs its earlier building when upgrading.

Art	Innovation	Focus	Unlocks
	Great Herd Enclosures	Civic	Clan Herdgrounds 7; Clan Herdgrounds 8
	Royal Equipment Workshops	Civic	Hideworks and Tanners 7; Hideworks and Tanners 8
	Established Trade Routes	Civic	Tribal Trading Grounds 7; Tribal Trading Grounds 8; City holding level IV; Temple holding level IV; Great Herd and Trading Enclosure 2; Great Herd and Trading Enclosure 3
	Great Clan Forges	Civic	Ore Pits and Clan Forges 7; Ore Pits and Clan Forges 8
	High Kingship	Civic	Clan Assemblies 7; Clan Assemblies 8; Great Clan Moot 3; -10% authority-increase Prestige cost total
	Royal Warhosts	Military	Skirmisher Grounds 7; Skirmisher Grounds 8; Warhost Gathering Grounds 2; Warhost Gathering Grounds 3
	Veteran Retinues	Military	Elite War Halls 7; Elite War Halls 8
	Great Wolf Packs	Military	Wolf Pens and Riding Grounds 7; Wolf Pens and Riding Grounds 8
	Stronghold Capitals	Military	Palisades and Stronghold Walls 7; Palisades and Stronghold Walls 8; Border Watchposts 7; Border Watchposts 8; Castle holding level IV
	Advanced Siegecraft	Military	Goblin Bombard

Native succession and law research retains its normal requirements. Ordinary native construction and non-law native research are excluded for Goblinoid heritage; existing saved buildings and discoveries are not deleted. Successor cultures retaining that heritage qualify.

This guide describes the current development mod; an older beta or Workshop package may not include these changes. Fully restart CK3 and use a new test game to check starting discoveries, progression and construction. Existing saves can retain earlier research and infrastructure. Script and asset checks pass; gameplay and in-game appearance still need testing.

Culture · Ancestry · Development · Research · Buildings · Duchy buildings

Castles, towns, temples and Sources grant +0.10/+0.20/+0.30/+0.50 base RP per month at levels I–IV. Sources have four playable levels. The separate annual payment is 1–2 RP. Direct ownership, occupation, bloodline storage and Source class requirements are explained in Monthly holding Regency.

Source research alternatives for every culture are listed in 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.

Any culture. Forest or taiga; non-capital barony; one Source per county.

Monthly Regency · Sources · Holding upgrades · Research alternatives