Chosen of the Holy Light: My Divine Spells Have Synergy!

Leon transmigrated into another world and became a priest of the Holy Light Church, wielding the power of divine spells. However, he soon discovered that his divine spells could actually level up? And after leveling up, they could gain different traits? And among those traits, they could even synergize with other spells?! Upgrading [Prayer of Light] synergizes with [Heal], granting a massive AoE healing aura! [Holy Hammer] synergizes with [Divine Hand], turning a single smash into a multi-hit hammer barrage! [Wish] synergizes with [Holy Hammer], granting the attacks a 100% sure-hit effect! Even [Divine Hand] can synergize back with [Holy Hammer], adding a paralyzing lightning effect to the strikes... ... The flames of imperial war are about to ignite. The Grey Fog erodes the world, the Abyss reveals itself, the Void Expanses spread, the God-Forsaken Lands expand, and the chaotic Elemental Domains devour everything... At the end of all these calamities, Leon stands alone before the many Lords of the Abyss, slowly raising a single finger. "Just one! I will only cast one spell." As his voice falls— A giant of radiant glory rises from the earth behind him. The Holy Light that incinerates all things hangs in the heavens, a thunderous hammer of divine punishment crashes down from the firmament, and tens of millions of divine spells surge forth like a majestic tide, swallowing all the shadows in the world. "This... you call this a single spell?!?"