A very confusing dialog box

[NikG]

 

I finally finished the choke point into act 3, and when I go to travel to Twin Elms, I get the dialog box shown. I have no idea what "critical path" is, or what increasing it will actually do. Is the critical path the main story quests, something to do with critical hits in combat, or something else?

Worse, I have no idea which button does what! Does "High Level" mean I will continue with my party at its current level, and "Standard" that something will be changed, or does "High Level" mean the difficulty level will be raised somehow, and "Standard" means to keep going as things are?

[Boeroer]

Critical path = main quest line (Thaos and stuff).

High Level = scale the difficulty up.

Standard = leave the difficulty as is.

[NikG]

Thanks! Now I can proceed with act 3 as soon as I get back from the gaming con this weekend.