These are the bonuses Tyrion gets with confederation.

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Factions that appear on both Mortal Empires and Eye of the Vortex.

Avelorn - Everqueen's Tour

1.Diplomatic relations: +5 with High Elves
2.Attrition: -10% casualties suffered from all attrition
3.Casualty replenishment rate: +5%
4.Missile damage: +10% for Sisters of Avelorn units
5.Range: +10% for Sisters of Avelorn units

Caledor - Mountain's Strength

1.Fire resistance: +10% (all characters)
2.Vigour loss reduction: -10% for Dragon Prince and Dragon units
3.Melee defence: +10 for Phoenix Guard units

Chrace - Hunters of Chrace

1.Bonus vs. Large: +10 for White Lions of Chrace units
2.Campaign line of sight: +25%
3.Melee attack: +5 for great Eagle and War Lion units
4.Speed: +10% for Great Eagle and War Lion units
5.Attribute: Vanguard Deployment (all characters)

Cothique - Realm of the Seafarers

1.Magic item drop chance: +25%
2.Leadership: +5 when fighting at sea
3.Attribute: Strider (all characters)

Ellyrion - Thundering Hooves

1.Campaign movement range: +5% for all armies
2.Growth: +10
3.Weapon strength: +10% for Ellyrian Reavers and Silver Helms units
4.Range: +25% for Ellyrian Reaver Archers units

Knights of Caledor - The Lord of Dragons

1.Physical resistance: 5% for Dragon Prince and Dragon units
2.Charge bonus: +25 for Dragon Princes units
3.Income from post-battle loot: +5%
4.Melee attack: +5 when in foreign territory (all characters)

Nagarythe - The Shadow King Comes

1.Hero self-defence: +10% chance of wounding agressors
2.Melee attack: +5 for Shadow Warriors and Shadow-walkers units
3.Speed: +10% for Shadow Warriors and Shadow-walkers units
4.Weapon strength: +5% when fighting against Dark Elves
5.Missile strength: +5% when fighting against Dark Elves

Order of Loremasters - Return of Teclis

1.Magic resistance: 10% (all characters)
2.Vigour loss reduction: -25% for Phoenix units
3.Hero capacity: +1 for Mages
4.Weapon strength: +10% for Phoenix units

Saphery - Enchanted Saphery

1.Winds of Magic starting amount: +5
2.Research rate: +10%
3.Weapon strength: +20% for Swordmasters of Hoeth units and Loremasters of Hoeth Heroes

Tiranoc - Master Charioteers

1.Construction time: -1 for Province Capital/Settlement buildings
2.Armour: +10 for Chariot and Skycutter units
3.Speed: +10% for Chariot and Skycutter units
4.Ammunition: +10% for Eagle Claw Bolt Thrower, Tiranoc Chariot and Skycutter units
5.Reload time reduction: +10% for Eagle Claw Bolt Thrower units

Yvresse - The Misted Lands of Yvresse

1. Melee attack: +3 for Spearmen, Silverin Guard, Rangers, Archers and Lother Sea Guard units
2. Melee defence: +3 for Spearmen, Silverin Guard, Rangers, Archers and Lother Sea Guard units
3.Charge bonus: +25% when in foreign territory (all characters)

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Factions that only appear in the Eye of the Vortex campaign.

Citadel of Dusk - The Invisible Citadel

1.Speed: +10% for all units
2.Hero and Lord recruit rank: +2
3.Income from Ports: +10%

Fortress of Dawn - The Fortress of Dawn

1.Public order: +2
2.Global recruitment capacity: +1

Tor Elastor - Passage Through the Sea of Dread

1.Physical resistance: +5% when under siege
2.Construction time: -1 for Ports
3. Ambush defence chance: +10%

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There are no high elf factions that only appear in Mortal Empires.