The Treeman can use his immense bulk and robust limbs to smash things that would resist any other weapons. It is said that Treemen can even shatter stone.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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A model with this special rule can choose to make a single Tree Whack in place of making his normal close combat attacks. If a model is making a Tree Whack, it must be declared before rolling To Hit.
To resolve a Tree Whack, nominate an enemy model in base contact. That model must pass an Initiative test or suffer D6 Wounds with no armour saves allowed. A character with this special rule may make a Tree Whack in a challenge.