The Holy Grail War of God's Blessing

After becoming a dead man, Manshu got a chance. He only needed to participate in seven Holy Grail Wars and win in order to be reborn.
He will join the Holy Grail War as a Servant with randomly obtained abilities and a blessing.
And the blessing he received was to call on the name of God to obtain God's power and blessing.
Shouting the name of Zeus will bring down thunder from the sky; calling the holy name of Michael will bring back the great feat of slaying the dragon; the wisdom of the great god Odin will bloom in the name, bringing the mystery of Rune...
Under the divine light of Ra, the Holy Grail is right before our eyes.