Order of Defense

[Falkor]

1. It does not stack when a certain number is granted but it does when the already high protection increases a bit. That means if a Pan has E2 or E3 after casting ironskin and earth power he has prot. 20. But when he gets heroic tough skin for overall protection 11 and then casts summon earth power and barkskin he gets both bonuses +1 from SEP (actually from additional earth level) and +1 from barkskin for overall prot. 13.
2. I only know that awe effect prevents petrification check.