I bought the skill Sacred Shield, and I have the rank III.
I want to know how can I use it without running out of MP
Can anyone teach me?
The skill basically says it in the description:
The shield's energy channels through the wielder and increases Max MP. While spell is effective, MP decreases gradually and damage taken is offset with MP . You can not be silenced while the shield is up. (can not be used with Spike Shield)
It will increase your MP but the 100% and at the same time gradually decrease a X percent of the MP. In your case, -5% of your MP each 2 seconds. It will offset damage taken with MP, but if you ran out of MP and skill is still active, it will keep draining the X percent of MP until it wears off.