Ment
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What if Libar runs instead of using invisibility? Level 3 blocks the passage and can withstand one attack, so in the next turn, Libar will successfully escape. You could pass the ring to Eledar; it might even be faster.
Even if you don't kill Mariho, invisibility still has many advantages: no one will chase you, and so on.
By the way, Libar is currently in a building, and no one can see him. Does he really need to spend a turn to go into invisibility?