As the raining night..someone summoned you. In the human realm

As the summoners draws a symbol in the floor using pig blood and many candles around it.He looks at the book.. called 'the blood demon'..he sigh as he read the book loud

"The night comes.. the rain drops.. the thunder goes loud.. my blood had come to summon you..."

He grabs a knife as he slice his hand. He groans a little as he drops the blood in the blood symbol. the symbol glows red.as the light flickers, you were summoned