Either the translation for the skill is wrong or this so called SSS rank skill is absolute trash... he seriously should have bought any passive sword skill and upgraded it... rather than some shitty 1 second immortality shit... honestly it's probably a error... it probably ignores all defense of the attacked and makes the mc immortal for 1 second... still I wonder if this skill will be also properly boosted by 10000% like in the beginning said and he becomes immortal for 101 seconds... probably not... still a passive sword skill would be better than this imagine it raising his spirtual energy by 1000 in it's sss form while also raising his stats by 5 then the 10k % would boost his stats by 505 and give him 101000 spirtual energy allowing him to use his skills whenever he needs them.