Exmelin is dreaded for what he does and the pirates only reluctantly fight beside him. It actually seems that his presence among the men drives them to fight more cautiously, just to avoid being in need of his treatment.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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A unit joined by Exmelin gains the Parry (6+) special rule. If they already have a Parry save, it is increased by +1. This rule has no effect on any characters in the unit.