We can get two settings. Serious, and meme.
I’ll start with meme.
Overlady is ruthless dictator, blessed with great power (magic, strength, something else, could be demonic or spiritualistic).
Amassed an army of mooks, perhaps something mindless like undead, or golems, or more warrior women, perhaps orcs or antagonistic human culture (the pic makes me think less desert-y Persians for some reason).
Is trying to conquest the combined kingdoms of the Ladyknights.
She is an utter domineering bitch to everyone, except her husbando whom she loves and cherishes and pampers like an exotic prize. Prefers to keep him from the peoples eyes so they don’t see her being soft. Maybe husbando is the source of her power or something.