The Otherworldly Grand Summoning System

Through a twist of fate, he transmigrates to another world, only to end up as the lowest-ranking gladiator in an arena, fighting beasts for the meager rations that keep him alive. He does have a golden finger, but just activating it takes a whole year.

Fortunately, his golden finger is exceptionally powerful. After a long buildup, it lets him learn all kinds of skills and travel to the worlds of films and novels from his past life. It cannot make him powerful overnight, but it can help him steadily build the foundations of a strong fighter, paving the way for an exciting journey through another world.