A Wizard's proposed world filled with grotesque men of greed and violence and culminating in apocalyptic warfare may be unsettling to some.
The most intense scene in the film is an Ogre destroying an inn to capture members of the quest. The battle with him that follows is also intense, and the Ogre's appearance may be scary for young children.
The scene where the chattering of Sand Murks threatens to drive some of the characters insane is quite intense, as is the characters' attempts to block it out, showing them getting increasingly more intense and agonised.
There are lots of fantasy creatures featured, some of which, like the Worm, Ogre, Sand Murks, Ommadon, and possibly even the evil dragons may be a little intense for very young and/or sensitive viewers.