As `ckdamascus`said item`s rase tell you what units you will fight to supress it. It also means that if you equip that item, and ifght units of same rase it`s morale will drop such as : Hand of necropolis, if you fight against undead, eventualy item`s morale will drop to 0% and you`l have to supress it to gain item`s bonuse.
This is way ot get more exp through more battles, but it is limited as for need to fight around 25-30 battles against 1 specific rase of units to get item to 0% morale.
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