Sharp as a Beast's Fang

Continuous attacks gradually ignore increasing amounts of the target's DEF, up to a maximum of 40% of its DEF (each attack increases the DEF ignored by 5%, additive). This bonus is lost when no attacks have been made within 3 seconds

Continuous attacks gradually ignore increasing amounts of the target's DEF, up to a maximum of 50% of its DEF (each attack increases the DEF ignored by 10%, additive). This bonus is lost when no attacks have been made within 8 seconds