How to become resistant?

[Yogol]

The ring "Corvus Bleed" (nice eastern egg, there!) says "Reflect 20% of any damage taken back to your target while Resistant is active".

So... how do you reach the status "Resistant"? What are the possible sources for it?

[Yogol]

Does anyone know?

[EckyThump]

Reinforced Binding (belt) gives Resistant on potion use,
Pillar of the Departed (unique heavy armour) grants it when you get down to low health.

I couldn't see anything on the warrior skill tree that granted it but I may have missed it. There's probably something there, and on other skill trees, and surely on more items too.

[Yogol]

I only know of fortifying shots and that only gives Resistant when you kill an enemy with a projectile ability, so it is not reliable at all.

There is also a rune, but it is only available at the end battle, lol.