Lucivar's desire was simple.
He wanted to be left alone since the tournament was approaching fast.
Despite his confidence in his ability as the Blessed Oracle, the champion of multiple Gods, he was not arrogant enough to think that he could win without making preparations. To secure his victory and make sure he delivered his promises, he needed to make preparations.
And doing that required time.
He needed to reach the Chrysalis rank, find out about the other participants, learn more about the stages, and many more. Considering that he managed to pull off his plan all this time—and succeed in getting what he wanted, he wasn't going to stop now.
A plan along with the fortune brought by his piling bad karma will get him far.
In order to be left alone, he needed to get rid of Callista.
Killing her would only result in more complications, such as creating a problem with Julian.
A problem that he couldn't handle at the current moment.
So the answer became clear.
