I am offensive -Break Damage Limit
I am defensive - Break HP Limit
I can surpass - Exceeds the limit on HP, MP and Damage
I can amass - Gradually rises the HP, MP and Damage of a character based on their stats
Technically, those are all correct. I was, however, looking for the answer: Break Limit Ability or Break Limit Customization. Whatever, since you said all it entails its close enough. You're turn!