A precocious fencer, labeled by a prophecy as "The Savior" must learn to unleash his inner warrior in order to prevent a ruthless general from destroying the known world.

'Precocious' is most often applied to children. Is this a story about a kid?

Agreed with Richiev, also there are too many vague descriptions used in this logline.
What does "...inner warrior?" mean? What will this look like? Is this a metaphor or a literal supernatural being inside of him? Most bad guys are "...ruthless?" in what way is this general ruthless? What makes him unique and especially difficult to beat?

Point is it is unclear what main action the MC will take throughout the film.

Hope this helps.

Way too vague, How does the General plan on destroying the world, what skill does a fencer have that would be of use to stop this. and why him? Why not the CIA or INTERPOL?