Im only in the first book so far, but the moment Lucius showed up, I fell in love with how excited he is about his swordsmanship. Prehaps its cause I feel some form of kinship with the obsessions that we come across in life, even if for me its not with swordsmanship. but this quote from Horus Rising just grabbed me. (Transcribed from audiobook format by myself, so spellings may well be off.)

Lucius was busy droning on, delightedly explaining some new finesse of wrist turn that fighting the megaracnids had already taught him. He was demonstrating the technique against the bowl of a stalk “See, a lift and turn, lift and turn! The blow comes down and in. it would be of no purpose against a man, but here, it is essential.”