Quartz
Hero
It's already been established that this is a Forgotten Realms movie.
Oh dear. I hope that those making the film base it off the story Days of High Adventure. The story itself has elements of sex but those aren't necessary for a film. And the nastier bits can be off-camera.
The story starts with some roleplayers around a table playing a game of D&D. They accidentally invoke the name of a 'real' Stygian wizard from the era of Conan. The wizard draws two of them across time in the hope that they might be powerful allies and is disappointed.
The boy is sent as a slave to an underground excavation site / mine and the girl is kept as a drudge and future sacrifice. Unbeknownst to the wizard, the boy has absorbed the strength of the man (a Cimmerian IIRC) sacrificed in the summoning. The wizard is trying to enslave an ancient red dragon that was imprisoned many thousands of years earlier by pre-human creatures. The boy meets a Cimmerian girl (cue Conan joke) who trains him in swordplay.
Meanwhile, the girl doesn't let on that she can read and reads the spellbooks, discovering that magic really does work like D&D (cue D&D joke). The wizard forgets to close the connection (magic basin) to the dragon one day and the girl and the dragon make contact and it teaches her. The wizard has visitors and kills them. The girl uses this opportunity to escape and is given shelter in a temple of Derketo where she practices her craft and grows up.
In the mines, there is a breakthrough and monsters spill out and start attacking. In the chaos the boy and his girlfriend escape. They have escapades on the way to finding the girl. On meeting up they put together everything they know and set out to stop the wizard. They attack the wizard's tower, killing apprentices and garnering magic loot, but the wizard himself has penetrated the excavation site and is preparing the ritual. The ritual is interrupted but not before the dragon is freed. The dragon isn't interested in fighting the heroes - it has philosophically moved on from violence, conquest and the like (plot twist!) - and returns the three heroes to our time. The story even gives two inter-credits scenes: one where the Cimmerian is in a pub and someone tries to force his attentions on her and she gives him a bloody nose and more, and one where the girl goes to the DM's house where he is in the middle of a MMO raid (product tie in alert!). She then seduces him but he forgets to mute the microphone...
You could make the film both PG and 18 just by playing some scenes differently.
There would be plenty of opportunities for cameos. Arnold as King Conan, for instance. Perhaps a ruined snake temple.
Oh well, it's a missed opportunity.