MP Skill Cost: -20%

I got a Question ...

If I have 5 equips with -20% MP Skill Cost Potential Line....

Would that make each my attack cost 0 Mp? since it would be - 100% MP cost?

and what happen if I go over the limit let say 6 Equip with -20% MP Skill Cost would I gain Mp after each attack instead?

I think it's in the same vein as the way ignore defense works, that you can never actually have skills cost nothing.

I think it's in the same vein as the way ignore defense works, that you can never actually have skills cost nothing.

This can be tested with two of those, equip them then cast a skill, if the MP cost is 60% of whats shown in the skill window, then its additively otherwise multiplicative.