Continuity mistake: When King Arthur invites Malignant to Camelot, there is a list of things Malignant demands. King Arthur has the list in his hand but you never see Malignant give him the list.
Suggested correction: Prince Malagant was in Camelot at the Kings invitation. The explanation happens off-screen as King Arthur's messenger delivered his message to Malagant and then returned with Malagant's list of demands.