How are each of the Dynasty Weapons obtained in Heroes VI?

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Might Affinity

Angelic Alliance - Complete Sidequest in Haven Campaign, Mission 4.

Arachne - Complete Sidequest in Necromancy Campaign, Mission 1.

Assassin's Blade - Buy from the Altar of Wishes. Requires Gold Dynasty Rank.

Blade of Binding - Complete Sidequest in Inferno Campaign, Mission 4

Dragon Flame Tongue - Wildcard (see below)

Edge of Chaos - Exclusive to preordering Heroes VI.

Iron Feather - Complete Sidequest in Haven Campaign, Mission 1.

Malathua's Cleaver - Complete Sidequest in Stronghold Campaign, Mission 2. (Blood mission)

Perfect Silksword - Wildcard (see below)

Silksword of the Kirin - Complete Sidequest in Sanctuary Campaign, Mission 2.

Souldrinker - Defeat an enemy hero as part of the main quest in Inferno Campaign, Mission 1.

Sword of the Griffin - Unlocked as part of the main quest in the Prologue Campaign.

Sword of the Wolf - Complete Sidequest in Stronghold Campaign, Mission 1.

Sword of Whistlebone - Complete Sidequest in Stronghold Campaign, Mission 2.

Batu's Totem - Buy from Altar of Wishes. Requires Platinum Dynasty Rank.

Heartrending Song - Complete Sidequest in Haven Campaign, Mission 2.

Soulreaver Staff - Complete Sidequest in Necropolis Campaign, Mission 1.

Staff of Asha's Eightfold - Exclusive to the Heroes VI Deluxe Edition.

Staff of Cleansing - Exclusive to the Heroes VI Deluxe Edition.

Staff of Sandro - Complete Sidequest in Necropolis Campaign, Mission 3.

Staff of Sar-Aggreth - Wildcard (see below)

Staff of the Tides - Complete Sidequest in Sanctuary Campaign, Mission 1.

The Oblivion - Unlock from Uplay with Uplay points.

Thunder Staff - Complete Sidequest in Stronghold Campaign, Mission 2.

Will of Urgash - Buy from the Altar of Wishes. Requires Silver Dynasty Rank.

You start with these artifacts unlocked if you own the complete edition of the game.