What you were expecting to happen, and what actually happened?
Lamia can use it ability endless.
What are the steps to make it happen again?
Start exploration task against Lamia team. Not sure if it happens every time. And don’t know if it happens in PVP.
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!
Don’t have video, only screen. As you see, after casting its spell Lamia has full mana (although mana shows 0), and can cast again.