Paladins can't experience fear.
Otherwise it'd be much harder to operate in Cheliax.
It is, to be clear, generally not worth it. Paladins can't experience fear, but they can experience eternal torture, and Cheliax delights in sending them on to it; there are places where more good can be done at a lower cost. But in the end, Cheliax is going to need to be overthrown, and you have to be in Cheliax to see the fractures when they start and can be encouraged in spreading. Plus, sometimes something really unexpected happens and you need to have people who can act quickly.
Andreu Bassols (not his birth name) has been living in Egorian for two years, having moved from a small farming village when his parents died and it didn't seem worth keeping up the farm alone. He loads and unloads river barges; he's a strong man, built for hard labor. He has, beneath the skin on his neck and separately beneath the skin on his thigh, two minor magic items, which conceal an aura that would otherwise radiate from him and betray him. Either would be sufficient, but it's a new experimental type of magic item, and either could fail, so it's better to have both.
He reads as having seven intelligence; his thoughts, when read, are slow, and uninteresting. This is the greatest sacrifice, aside from the possible eternity of damnation; the effect could not be manufactured. It had to be induced for real. He can lift it, when he puts his healing to that purpose, but it's risky, so he does it rarely.
He did it this morning; knelt in the cellar he sleeps in, the walls and ceiling too think for Detect Thoughts, and healed himself, and read an encoded report delivered on a river barge, and broke down the plan into steps he would still, later, understand.
It's afternoon, now, and he is pushing a wheelbarrow of potatoes into the kitchens of the palace in Egorian.