In my previous life and this present, the greatest weapon that I possessed was my Energy Control. Although I was disadvantaged at first during this second life for starting three years late compared to Yuko and the Heroes, once I awakened Energy Control through my Psyche-type Pathway and continued progressing on my Adaptability and Mortal Pathways, that evened out the gap of 3 years.
Except for the World's Wills of different Mortal Worlds, no one could contest me with my Energy Control. That includes the Principal and even Remilia.
I lost against Remilia not because of her Energy Control but because of the overwhelming gap between our UPL. Back then, there are probably more than 1000 UPL gaps between us. If she wanted to, she could truly crush me without exerting too much effort on her part. That's why being able to talk to her and to get her interest could be said to be my lifesaver.