Versatile Mage: Start by Summoning Elves

Lin Xuan traveled through the black hole and came to the full-time mage. This world has brilliant magic, but there is danger hidden under the prosperous surface.
Demons are watching covetously outside the city, treating human beings like ants. The darkness lurking in the darkness is like the Black Vatican, which takes destruction as its glory, causing fear and death.The forces led by the Holy City kill so-called heretics just to maintain their rule.
Facing the invasion of demons and the world in turmoil, the legendary summoner Lin Xuan led the elves to suppress everything, "Even if I have to carry the Holy City on my back and have to suppress the darkness with one hand, I, Lin Xuan, am still invincible in the world."
ps: This book should be a slow-burner, and the protagonist's strength may be relatively slow to improve in the early stage.
For some characters in the original work, I personally want to change their destiny. The protagonist's strength improvement is mainly based on the summoning system and supplemented by others.

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