The trick is since Assurance ignores penalties, if you know it'll succeed then it'll always succeed, even if you're at full MAP. You can also bump a higher level enemy down into the "success" zone by inflicting debuffs to their fort or reflex DCs. A fantastic combo is Intimidating Strike -> Quickened Strike -> Trip (Assurance) on a fighter, setting up your teammates and an AoO with fair reliability. It's better to rely on your teammates to inflict greater status debuffs than Frightened 1 though.
Oh very interesting. Banking on reliably getting the success at the cost of never getting the crit success?
The trick is since Assurance ignores penalties, if you know it'll succeed then it'll always succeed, even if you're at full MAP. You can also bump a higher level enemy down into the "success" zone by inflicting debuffs to their fort or reflex DCs. A fantastic combo is Intimidating Strike -> Quickened Strike -> Trip (Assurance) on a fighter, setting up your teammates and an AoO with fair reliability. It's better to rely on your teammates to inflict greater status debuffs than Frightened 1 though.