The largest tree spirits do not fight with grace or finesse, but with huge sweeping blows that strike home with enough force to shatter stone.
Source: Warhammer: The Old World Online Rules Index
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Once per turn, during the Combat phase, a model with this special rule may use one of its Attacks to make a single 'Tree Whack' attack. To make a Tree Whack attack, nominate a single model within an enemy unit that this model is engaged in combat with to be the target of the attack. That model must immediately make an Initiative test:
If the test is failed, the target suffers D3 hits, each using the Strength characteristic of this model, with no armour save save permitted (Ward and Regeneration saves can be attempted as normal).
If the test is passed, the target manages to avoid the Tree Whack.