When she negotiated with C regarding the demise of the villains in her lives, she wanted the others to experience so much pain and leave them no room to rise up again. that's why, she opted to send them in a coma that will leave others no choice but to let them go willingly.
After all, you can patiently wait for a few years but what about a decade?
Who will be paying for those bills?
Of course, when it comes to death, she didn't want to personally kill anyone, which is why letting someone else do it was just right for her.
As for Lyan, she wanted him dead as quickly as possible. She didn't even want to give him a chance to remain alive for even a day. This man, who haunted her in both lifetimes, he must die and never be reincarnated again, lest his obsession follows him in his next life.
Which is why she had everything prepared for this moment. She just wasn't sure what kind of ailment C gave to him this time. She was actually very curious.
