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Not quite sure how to phrase this but.. I have a feeling that Carlein is the one behind the murders. Here are my thoughts supporting this:
-> Carlein is the only one strong enough to be able to kill these people so quickly and without trace, as he is the leader of the mercenary ,he would have had beforehand practice to dispose of any evidence in a short period
-> I'm speculating Carlein to be the person who snuck into Latil's room because, again he is the only person among the consorts to possess the ability to move stealthily not to mention,
Latil did declare that it her room's surrounding area was built in such a way that no one could climb it.
-> Another reason why I feel that the murders are leaning toward Carlein is because of three very distinct things
1)His odd demeanor and responses to Latil's question of
"since when have you known me?" "before you were born."
Sounds kind of suspicious if you ask me.
2)His infatuation with Latil and the way he was very free with touching her the very night she went to him.
In fact Latil had to tell him to stop touching her.
3) His obviously malignant threat /warning to Ranamun in chapter 38,that included the other consorts as well.
(as mentioned on my previous post.)
-> We haven't had any real reveal with respect to the physical abilities of the five guys except in bits when other characters shed praise about their abilities or a small clash between the consorts themselves as seen in chapter 39 when Guesta bruises Tasir's wrist.
->Klein is another possibility whose extraordinary strength has been mentioned quite profusely throughout the manhwa but personally I do not think he is swift enough to be able to sneak into Latil's room or kill the mage because he wouldn't see the sense in doing so.
->Plus Klein doesn't seem to have any actual ill-intention towards others by physically maiming them and he is by far the most transparent personality around Latil.
-> Another possibility is Guesta but he also doesn't have any motive to drive him to kill anyone though with the way he gets ticked off with Tasir shows that he can hurt someone if he wants to.
-> Besides Guesta wouldn't take such a chance because he wants to keep a clean slate before Latil.