User blog comment:ArthurBestHusbando/Shakyamuni/@comment-38673582-20190913164612/@comment-33940255-20190913175612

If you interest about it you can read the info from Typemoon Wikia https://typemoon.fandom.com/wiki/Saver_(Fate/Extra)

Didn't notice that he has all EX rank skill and NP except Saver (I made up the passives). 50% NP charge on a neutral class ST Quick servant is pretty good with just a Skadi support providing the buffs and NP charge. That the reason we don't have neutral ST Quick servant with Charge Skill yet.

That why I make his NP overcharge effect not very useful otherwise he can be pretty OP. Also his NP gain is also mediocre to prevent NP Spam. Quick too OP