An unexpected encounter

Louis woke up in a training arena.

He had looked around the place but found out that the area surrounding the arena did not exist. He figured that he was either in a dream, or in some sort of strange dimensional space. Either way, he was trapped here.

The training arena had a sword at the middle. It was a two-handed sword, but its blade was pretty dull, almost as if it was beyond its intended use. Louis decided to pick it up, he figured having a useless weapon was better than no weapon at all, and he noticed a small inscription on the floor.

Swing this sword a thousand times.

He figured that however had created this space, had wanted him to follow the engraving to escape. He sighted; physical activity was his greatest weakness.

He believed that, when he entered the dungeon, he was forced to teleport here, and that this place detected an individual's weaknesses.