Tower Defense: Summon the Silly King at the Beginning

Travel into a familiar online game and enter a dark tower defense world with endless dark creatures. Becoming the fifth prince who was framed and exiled, Liu Ruian came through time and expressed great fear. Fortunately, we got a strange summoning system? Can summon various beings Knight King Saber Artoria... Wait Answer the call! But as time goes by, the exploration deepens. I find that the world is becoming less and less simple. Dungeons and Demon Realms, a hymn of courage! The hymn of mankind! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.