What is "Fortitude DC?"

[Feegle]

I didn't participate in the playtest, so this is my first encounter with the Ruleset. As was the case with 1e, the book is hard to parse when you have a specific question - the Glossary and the Index are both lacking in this regard. Specifically:

Quote:

Shove (Single Action)

Attack
Requirements You have at least one hand free. The target can’t be more than one size larger than you.

You push an opponent away from you. Attempt an Athletics check against your opponent’s Fortitude DC.

What is a "Fortitude DC?" Is this like a defense, where it's 10+Fort modifier? Or is it an opposed roll? I've just spent 45 minutes with the Core Rulebook attempting to find a definition somewhere, plus another 15 on AoN.

[Micheal Smith]

This is simply 10 + the total modifier for that saving throw.

See pg. 449 Right under the Will saving throw calculation.

[Nightwhisper]

In the glossary and appendix, this is located under DC (Difficulty Class), page reference 445, and Difficulty Class: "To generate a DC from a modifier (like Perception DC), add 10 to the modifier".

On page 445, the information is in the right column, subheading Calculating DCs.