[Question} Dual Blade Skill [ Asura Anger]

i didnt have a dual blade , just want to ask ..

Dual Blade : Asura Anger

this skill can ignore all damage ?
like paladin hyper [Sacrosanctity] ?
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and
dragonic katara [ Effect : Devil type monster deal more 20% dmg ] ?
this effect work on boss ?
chaos root abyss boss is devil type ?

sorry my english poor =(
hope this question u all understand .