Well, it may be a bit difficult to stretch out an entire LFD with just that subject, but I can tell you that since Rasputin had activated MIDNIGHT EXIGENT, a protocol that puts his survival above any other command, he was largely silent during the entirety of the Dark Age, or when the Iron Lords were roaming around. SIVA was only really discovered and sought after by the Lords, so that it may help the the citizens that were previously under the Warlord’s rule. Radegast learned about a SIVA replication center, and went with all the Lords to go investigate, but didn’t know about how the SIVA in that chamber’s code was changed. This replication chamber (from what I can remember) was near one of Rasputin’s subminds.

Wasn’t Rasputin in control of that SIVA?

A submind of his, yes.