Please help me find this movie
Hello, i need help finding this movie. It's about two brothers that somehow get transported into a fantasy world when they were trying to find their dad. There they meet some dinosaur looking creatures used as carriage etc. and they meet the princess of the town. The princess also shows them some set of rules but the last rule is scratched out/damaged somewhere in the middle Iiirc the last rule was something like ''Find the li-''. The town's electricity is powered by some sort of white stones but at some point that power is starting to dwindle and the power gets cut out at times (not sure about this part). The two brothers go into some sort of training, the older brother is afraid of heights while having to learn how to ride a pterodactyl looking thing but he eventually overcomes it. Eventually they somehow go into this underwater cave, find the stones and their dad.
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