Why do you all think malivore wants cleo cause its revealed as more than revenge, he had some inspiration from her and instead of killing her he locked her in the dark dimension, and even all those years ago when she made him his vessel he clearly wanted more from her. Idk what it could be though, it cant be to make his phoenix forms unless its revealed he is unable to get his phoenix powers back and she is his 2nd best option to create phoenixes loyal to him and he merely used landon as a means to an end for manipulation rather than reviving the phoenix side.
Im curious if you all have theories of your own perhaps better than mine.