The Devilsknife takes around a minute longer to obtain because of the attack animations in the Jevil fight. Even ignoring that, in the King fight you can't kill him in less turns unless you use Rude Buster strategies, that are very difficult without even saving that much time because of attack animations again.
It doesn't stop there, in Chapter 2 you get the Auto Axe which gives 4 AT. This is only 1 lower than the Devilsknife, making it so having the Jevilstail that gives 2 AT actually grants you higher total AT. Even factoring in that you have 2 more magic with the Devilsknife, each point of magic grants 5 damage on Rude Buster and 6 damage on Red Buster while each point of AT grants 11 per Rude and 13 per Red. Getting the Jevilstail also allows you to 3 Turn Berdly 2 by putting the Jevilstail on Noelle, and you can 1 turn the Maus fight by putting the Jevilstail on Ralsei.
Essentially the Devilsknife deals less damage, takes longer to get, loses time to multiple Jevilstail strategies, loses 1 AT on the Giga Queen fight, and there aren't any fights where the 10% TP decrease speeds up the fight dramatically.
This Guy Seems Like The Type Of Guy To Die To Scissor Dancers.
runner you are cheating in the spmaton fight by shooting many big shots that is a gltich
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