P61 explains how it applies to Mind Control
P108 is an overview.
2006 in http://forums.sjgames.com/showthread.php?t=18445 PK mentions the +70 version is necessary to avoid the cumulative -1 for each additional target in the area if combining Area Effect and Malediction
- The advantage to Persistent is that it is additive -- if you concentrate for an hour, then you get an hour, and you get the Persistent time on top of that, once you stop concentrating.
- With Independent, you can't get that hour. No matter how long you're willing to concentrate for, you get minutes equal to MoS. That's it. No more, no less.