I love the inclusion of Atlantean lore, and how Conan frees himself from slavery and acquires the sword from the old Antediluvian kings. Thulsa Doom's cult is modern, it seeks to destroy the old gods, to make a twisted utopia of suicide. Conan, who inherited the respect for steel from his father, finds strength in tradition and in survival.
His first act is to use the sword to defend himself against the wild dogs who chased him to the Atlantean cave in the first place. This is important because wild dogs were used earlier by Thulsa Doom to kill his father when he was a child, so this whole sequence shows his ascent to self competence and adulthood. So cool that the steel is almost stumbled upon. He is trying to escape the same fate as his father and in a way the sword itself saves him. The steel shows up, a flashing literal light in the darkness, and it helps him defend himself against animals as well as free himself from his chains.
The storytelling in this movie is off the charts.