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Blood of Valyria - A AGOT Submod

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In George R. R. Martin’s universe, the Valyrians are an ancient people from the Valyrian Peninsula. For centuries — even millennia — they practiced marriage within their own family to preserve the purity of their blood.

Before the Doom of Valyria, several Valyrian families had already settled in Westeros: the Targaryens, the Velaryons, and the Celtigars. After the catastrophe, these houses were the last remnants of that people on the continent. The Targaryens, in particular, established their rule through fire and blood by forging the Iron Throne 🔥

Over time, these families began to marry into Westerosi houses, while still maintaining the Valyrian tradition of incest. For many in the known world, “a name makes the blood” — a phrase that reflects this perception. However, genetically speaking, that’s not the case: a child born of just one Valyrian parent is far from a pureblood.

Several examples show the consequences of this dilution:
-Helaena and her brother share about 37% Valyrian blood, and their children are born with deformities.

-Aegon IV (31% of valyrian blood) and his sister-wife had only two surviving children.

-Jaehaerys II (3%) marries his sister — only two children are born (low fertility compared to other royal couples).

-The first, Aerys II, is infamous for his madness 🔥 Aerys marries his sister — their union is marked by miscarriages, children who die young, and an unstable heir. As for Daenerys, although she remained sane for most of her life, she descended into madness by the end of the series…

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Removes the -95% inbreeding penalty for Valyrian houses (but keeps the diplomatic bonus).

Adds a system of genetic traits representing the percentage of Valyrian blood (from 1/32 to 32/32).

The percentage is shown in parentheses next to the trait name (e.g., 16/32), allowing for easy distinction even if traits share similar descriptions.

Each trait gives:
-An inbreeding resistance bonus (from -3% to -100%),
-A health bonus against diseases (from 0.03 to 1)
-An attraction opinion bonus (from +18 to +50).

It also gives you the possibility, via a game rule, to have an event when launching a new game in order to remove the dragons.

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This mod introduces a more realistic approach to Valyrian genetics. A prestigious name is no longer enough to bypass the consequences of inbreeding!

You can no longer marry into Westerosi houses for three generations and suddenly go back to incest without repercussions… This adds real challenge and roleplay depth 😏

Fun example: if you start as Viserys III, you’ll have a 75% inbreeding penalty if you try marrying Daenerys…

Also allows you to not have dragons in bookmarks where there are any (only if you want).

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Three game rules (enabled by default):
-Automatically grants the trait "The blood of dragons and gods. (32/32)" to High Valyrian characters appearing mid-game.

-Automatically grants the trait "Closer to gods or men? (16/32)" to Westerosi Valyrian characters.

-Same for Essosi Valyrians.

-Deleting dragons (disabled by default): an event appears when the game starts, asking you if you really want to delete them.

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The mod is available in French and English (but as English is not my native language, please be kind 🙏)

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-Requires the A Game Of Thrones mod..

-No known conflicts with other submods (see modified files below).

-For use with AGOT+, install the compatch: https://steamcommunity.com/sharedfiles/filedetails/?id=3488046120

-For use with Legacy of Valyria+, install the compatch: https://steamcommunity.com/sharedfiles/filedetails/?id=3524852195

-Can be activated mid-save, but not recommended for optimal experience.

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• 00_agot_dynasty_modifiers (common → modifiers)
  
• 00_agot_dragon_scripted_modifiers (common → scripted_modifiers)
  (history → characters) :
  
• 00_agot_char_crownlands
  
• 00_agot_char_crownlands_ancestors
  
• 00_agot_char_dorne
  
• 00_agot_char_dorne_ancestors
  
• 00_agot_char_reach
  
• 00_agot_char_reach_ancestors
  
• 00_agot_char_riverlands_ancestors
  
• 00_agot_char_stormlands
  
• 00_agot_char_stormlands_ancestors
  
• 00_agot_char_vale_ancestors
  
• 00_agot_char_valyrian
  
• 00_agot_char_valyrian_ancestors
  
• 00_agot_char_westerlands_ancestors

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Some historical characters (like Lucerys Velaryon or Viserys Targaryen, brother of Jaehaerys I) who died as children may not visibly display the mod trait in bookmarks where they appear dead.

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You are allowed to use this submod in your own mods. I reserve the right to use your additions and improvements without prior permission, but I will notify you and give proper credit 👍
I’d be happy to collaborate with other modders to further develop this submod into a rich and immersive RP and gameplay extension! 🎨