Huh? (I don't know whether it's a spoiler or not ) This is just an assumption,ok?
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But I thought that the red haired guy (?) inside that egg was Merlin's brother. Maybe Bahn did some experiment on him and turned him into a demon-human hybrid or something. I mean that guy had red hair (his brother can use fire magic. It's common for fire magician in anime to have red, orange or pink hair) and there were various cuts and scars on him (maybe because of the experiments?) He's probably stronger now and would try to kill Merlin again.
P.S. Whether Merlin's brother is alive or not, Cecil and the King of human kingdom deserve to die (they are both horrible)
I know I'm gonna get hate for this comment so I'm not even going to bother replying to all those who will try to fight me with my opinion.
I really fucking hate Cecil and Vachae's guts. Why? Because Merlin's brother is fucking dead and they're just playing him for a fool. Specially Vachae, totally at par with Cecil having no loyalties to anyone but themselves. I feel so bad for Merlin's brother. And I think Bhan made a Frankenstein out of body parts from the humans including Merlin's brother. Just thinking of the anguish that Merlin would feel from all this shit Cecil put him through, just makes me wish Merlin could just go OP and wring Cecil's neck dead, please add that vapid bitch Vachae on the list too.