Rock Aurochs

If Charging, the model part can make a Special Attack which is resolved at Agility Step 10, and inflicts X hits, using the model part’s Strength, Armour Penetration, and Attack Attributes, but not Weapons.
Remember that attacks multiplied into several hits are allocated after establishing how many hits are scored (i.e. after the attack has hit). If more than one model part of a combined model has Impact Hits, only a single model part (chosen by the model’s owner) can perform its Impact Hits in a Round of Combat.

If the attack hits with a to-hit roll of ‘6’, it causes one additional hit (usually this means it causes two hits instead of one). This additional hit is allocated towards the same target.

A model part with Stomp Attack can make a Special Attack which is resolved at Agility Step 0, can only be allocated towards a Health Pool of Height 0–1, and inflicts X hits, using the model part’s Strength, Armour Penetration and Attack Attributes, but not Weapons. If more than one model part of a combined model has Stomp Attack, only a single model part (chosen by the model’s owner) can perform its Stomp Attack in each Round of Combat.

During Combat Choices a model part can only choose Innate Weapons if it has no other options.
All model parts with Beast, Construct, or Mount come equipped with Innate Weapons as their default equipment and cannot lose them.