Arelith

Problem - Warlocks created before Bear's Endurance was added to Fiendlock suite do not get it.
Hope - leveling up might give them the spell?
Result - no it doesn't

New characters have this spell automatically upon leveling up to the corresponding level.

I can't see anything where fiendlocks are supposed to be getting endurance. Might be like last time bards got spells, where you can take it and it doesn't go away, but you aren't supposed to have it?

It seems like it was gained when I took 4th level, which is when you get Bull's Strength. All the other spells also went away as normal, but this one stayed. I know the wiki can be out of date. So I'm not sure whether new warlocks getting it is incorrect, or if old ones might be bugged (or SoL)