Darkspawn and Fire vulnerability/weakness

I thought they were vulnerable to Silverite runes/weapons.

In DAO, silverite runes added a specific + damage to darkspawns depending on the rank, but they were weak to fire damage (and resistant to nature damage).
In DA2, silverite is a basic component for all runes and darkspawn were weak to spirit and nature damage.
In DAI, silverite was a high grade crafting component, but it had no property against darkspawns. Not actually sure of the darkspawn weakness here.

In DAVe, darkspawns are vulnerable to fire again and resistant to necrotic damage. Not info about silverite yet.