I understand from what it says in game that a captain with this trait, and their nearby allies are granted a resistance to the corresponding damage type. How much is the damage reduced? Will this trait cause other captains allied to this one to also receive a resistance, or is it just the grunts? How “nearby” do the allies need to be to receive benefit from this trait? The text in game is rather vague, so I’m trying to figure out if the trait is worth anything or not.

To put it into context, I’m trying to find an optimal combo for an Overlord, and 2 bodyguards. My overlord has no weaknesses, but can be damaged by fire. I’m hoping if I assign him a bodyguard with fire warder, it could negate this vulnerability to a degree.