[MOD] Scenarios and campaigns: original, Hammers of Fate.

Exactly, something like that was done using a DLL file and possibly scripts.

In principle, it is quite possible to implement the transfer of assembled artifacts for a mod on campaigns. To do this, simply link it to a special script file and write the necessary code in each mission. The main thing is that this does not break the balance and the passage of maps where you need to find artifacts (it's good that this is only in Markel's campaign, but it will also fit in there adequately).