Context: Harima Kenji 播磨拳児 is about to get violent.
ima sara kono ore-sama no osoroshi-sa ni kidzuite-mo oso-sugiru ze...? 今さら この俺様の 恐ろしさに 気づいても 遅すぎるぜ･･･？ Even if [you finally] noticed how frightening this me is, it's [already] too late.
ima sara 今更 Only now. After all this time. Finally.
osoroshi-sa 恐ろしさ Frightening-ness. How frightening. (sa-form.)
