When a Dinoz attacks, the default behaviour is to assault. The assault strength is a combination of the element level times five (*5) and any skills that modify the assault strength. The damage is determined by the assault strength and the defense level of the target for the element.
The assault may at times be replaced by an attack using one of the attack skills the Dinoz knows.
Boosting attack strength
Good way to increase assault strength is to increase elements strength. Every point to element give +5 to attack power of that element.