Block Mage

This is originally a peaceful mountain village, but the Demon King from afar is about to awaken, and in order to fulfill his dream of invading the world, he has decided to send his demons to take over the village and take away the block magic that has been passed down from generation to generation in the village.
And you, as the inheritor of the block magic, vow to intercept the demons here, use the powerful block magic to fight against the demons, defend the villagers, and fight for the block.
"Be the block mage guarding the village, defend the villagers' peaceful land against the demon army sent by the Demon King, and prevent the block magic from being taken away by the Demon King.
You will use the blcok magic inherited from generations of guardian mages to crush the demon army and protect the innocent villagers.
The casting of the block magic will determine the future of the village.
Fight for the block!"