sbarrie said:
I'm not sure exactly what you're refering to, in fact it sounds like you answered your own question. But if you're looking to continue the Endurance - Diehard - Toughness chain, I'd add Great Fortitude as the fourth.
The standard Borderer gets Endurance at 3rd level, Diehard at 6th level.
The Hyperborean variant gives Endurance at 2nd, Diehard at 5th, Great Fortitude at 11th.
So you have for the Endurance chain 5 levels: 2, 3, 5, 6, 11.
But you have only 4 feats: Endurance, Diehard, Toughness (= the chain), plus Great Fortitude (outside the chain), in the Hyperborean variant given at 11th level.
So 1 feat is missing.
2 Endurance
3 Diehard (but according to Hyperborean variant at 5th level)
5 Toughness
6 ???
11 Great Fortitude
I hope, I could make my problem clear. Or am I missing something obvious?