Larian Studios Forums Divinity 2 - Ego Draconis (English) Help/Tips/Tricks Heightened Endurance??

I did a search of the forums but did not find anything on it, so I am posting here.

After talking to that strange shady lady on the 2nd floor (or 1st floor- depending on what English you use) of the Black Boar Inn, I got a strange buff called 'Heightened Endurance'. Now I am not complaining, but what is Endurance in this game? And how come it got heightened? It has no time limit on me too, so I guess it is.... infinite?

Anyone knows what this is?

Is it a buff from equipment you may have gotten then, or a skill you learned?
I don't know what endurance is, in this context. The only mention in the manual is for the Heightened Endurance buff, and that only says that your endurance is being boosted.