BackSource: Warhammer: The Old World Online Rules Index

Unnatural Fortitude
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AbilityCharacters (+20 points per model), Units (+2 points per model)

Blessed by the Ruinous Powers with great resilience, some warriors' flesh can turn aside steel.

Unless they are wearing heavy armour or full plate armour, models with this Chaotic Trait improve their Toughness characteristic by 1 (to a maximum of 10).