Kendarie Castle is a location in Lost Kingdoms.
In Lost Kingdoms, Kendarie Castle has not been touched by the Black Fog and seems to be a fairly prosperous land despite everything else.
Princess Katia arrives looking for word of her Father's disappearance. The Lord, a fat dolt of a man, arrogantly proclaims he has not been seen. However, when Katia leaves, a Knight stops her and begs her to find their stolen Runestone. The stone has been taken captive by Helena, whom Katia has met previously.
Replaying this level after completing the game simply replays the cutscene, and there is no benefit to the player for doing so as there are no monsters or rewards.