

"Travel to a negative year" - always fails because of Tempus Rumpit cards
Hello all!
I’m trying to unlock the ‘Negative Year’ achievement with the King of Time, but I don’t understand the mechanics of the ‘Tempus Rumpit’ cards. I’m currently in Year 34 (+265); I placed portals each time I can for almost one hour, it failed. I managed to place six portals at the same time, each of which sends me back five years, along with two shrines. So it was possible. I manage to get as far back as Year 15 and then, bang, two “Tempus Rumpit” cards appear, along with a message saying I’ve broke space-time continuum, and I’m sent back to Year 34. Could someone please help me by telling me what I didn't get about those null cards?
(my orbiters are strongs enought it seems and my base too)
Thanks a lot!