Ring Duration: The description should be clearer. It should be made clear what breaks a Ring (a straw layed across it?), can a ring affect something outside it, can you make a Ring and bury it so that it is never broken, can you place a Ring duration at the first room of a tower that tears it from the earth, and so on.
Help in the Lab and Familiars: By the current rules you need Leadership 3 to have three lab asistnats, and Leadership 0,1, or 2 will lead to 2 lab assistants (familiar plus one more). I suggest altering the last sentence on the relevant paragraph to "A familiar doesn't count towards the limit on the possible number of lab assistants", which would mean a character with Leadership 2 could have three lab assistants (familiar plus two). The advantage is that a magus would now be able to benefit from Leadership 1 (lab assistants), whereas before he needed Leadership 2 (lab assistants). It's nice to have every point count.
Original Research: Please clarify the rules further, especially post-errata where the examples and some of the text don't fit the changed rules.
Twilight: Please either delete the simple die of WP gained in twilight, or change the example to include it.