Bloodline

The Bloodline upgrade appears at the 7th reincarnation and requires to have bought a total of 100 "Faction upgrades" of each faction, total across reincarnations. Upgrades such as Trade Treaties, Friendship Pacts, Alliances, Heritages and Spell Upgrades all count towards this.

This upgrade enables to choose a Faction Bloodline, giving a kind of cross-faction perk that resets at abdications.

Cost: Coins equal to the number of Gems you have +1.
Trophy & Upgrade: Bloodstream
R28+: Starting from R28, you might get Bloodspring research upgrade, that will grant you bloodline of the faction you're currently playing, in addition to the bloodline that you have chosen by basic upgrade.

Faction Bloodlines
Faction		Effect
	Fairy	Increase the production of Farm, Inn and Blacksmith based on the assistants you own. Formula: 250*x0.9, where x is the number of assistants you have.
	Elven	Increase the chance to find Faction Coins by 350% and autoclick three times per second. Autoclicks made this way benefit from a 100 times higher clicking reward and Faction Coin find chance.
	Angel	Increase the production of all buildings by a cumulative 0.5% per second while you have at least one active spell. Falls off by 10% per second while you have no active spell.
	Goblin	Reduce all building cost multipliers. Reduces cost multiplier by 0.02; with no other reductions applying, the multiplier will be 1.13 instead of 1.15.
	Undead	Gain additional assistants based on the amount of times you reincarnated. Formula: floor(8*x0.8), where x is the number of times you have reincarnated.
	Demon	Increase mana regeneration based on unlocked trophies. Formula: floor(0.6*x/10), where x is your Trophies Unlocked stat.
	Titan	Increase the production of all buildings based on the amount of Royal Exchanges you purchased. Formula: 15*x0.85, where x is the amount of Royal Exchanges you own.
	Druid	Increase mana regeneration based on maximum mana. Formula: 0.02*x%, where x is your maximum mana. Alternatively, max mana * mana generation / 5000 will give its mana production bonus provided you don't have the bloodline yet.
	Faceless	Gain additional faction coins per second based on the amount of mana produced in this game. Formula: floor(2*ln(1+x)3.5), where x is your Mana Produced (This Game) stat.
	Dwarven	Gain additional assistants based on all the following actions: Treasure Clicks Formula: floor(ln(1+x)), where x is your Treasure Clicks (This Game) stat. Buildings Owned Formula: floor(x0.275), where x is your Buildings Owned (This Game) stat. Spells Cast Formula: floor(x0.23), where x is your Spells Cast (This Game) stat. Excavations Formula: floor(x0.43), where x is your number of excavations purchased.
	Drow	Increase the production of all buildings by a cumulative 0.1% per second while you are off-line by at least 1 minute. The value is preserved when you come back on-line, and persists through abdications.

Bloodstream

Unlocking all Faction Bloodlines grants the Bloodstream Secret Trophy, which in turn grants the Bloodstream upgrade.

In-game description: Increase the production of all buildings based on the time spent as faction of the bloodline you are using. While you are Mercenary, a fraction of the total time spent as mercenary is added to your Bloodstream bonus based on the amount of mercenary upgrades purchased in this game from the faction of the bloodline you are using.

• Effect: Increases the production of all buildings based on the total time allied with the faction bloodline you are playing. ('Time Spent Allied with' at the bottom of the stats)
• Cost: 1Tg (1e93 coins)
• Formula: 0.1*x0.65%, where x is your (adjusted) time spent affiliated with the bloodline's faction in seconds.

For Mercenaries Bloodstream works slightly differently, and only a fraction of your "Time Spent Allied with Mercenary" is used. This fraction depends on the amount of upgrades that match the bloodline faction used in a build.
Mercenaries have 12 upgrades, so each matching upgrade represents 1/12 of the total Mercenary time. As Factions have 9 upgrades, the maximum fraction possible is 9/12.
Hovering over the Bloodstream upgrade, the tool-tip will show the Adjusted time spent.