[Alneyan]

The results of this lab controlled experience are as follow: the Nornas seem to stack their abilities, but do not convert bad events into good events.

The facts: 15 Nornas were enough to protect the capital from bad events for 100 turns, but four nasty events struck down the capital just after they left (two events in two turns). The odd for events was set to be much higher, and the odd of a bad event was set to well over 100%.

Given the quality of the Norna protection, I am inclined to believe their ability does stack. I believe the Nornas had a 9% chance to miss blocking any bad event, but they managed to catch all the bad events, and there were likely more than one event per turn. It would also explain why my 25 Nornas were enough to block all bad events for 200 turns, though they were much less likely to fail blocking an event (1% and some).