For experts, actual battles are the best way to ascertain one's skills. Even if a skill may seem incredible and high-tier, if it is unable to prove its worth in an actual battle, then it is useless.
The most recent battle I had with Rosemary's (Carlohin) Undead Army is probably the most intense one since my rebirth. As far as I was concerned, it was also the perfect opportunity to test my abilities and determine future routes for development.
There were quite a few problems that were revealed through battle. Among them, the most obvious of them all are that I have too many power systems, the absence of a decisive killing move and the powers and techniques I was using against each and every enemy were a little chaotic.