In addition to the mythical power of Excalibur, there is magic, betrayal, and fantastical creatures. Merlin gets only a casual mention, but in his place, are the Mages, possessors of powers of their own, which in this case are used to assist Arthur. The villain isn’t drawn very well, coming across as only power hungry, and willing to do absolutely anything to get, and keep it. This leaves him less interesting which only adds to the disjointedness of the various elements that make up the plot. There is a plethora of characters, none of which feel fully fleshed out, this includes Arthur himself.

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References:
-http://www.avsforum.com/king-arthur-legend-sword-blu-ray-review/
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