User blog comment:Koishi-Komeiji/Iroha Tamaki/@comment-32751919-20190826155628/@comment-24965192-20190826163354

Yes, her Magia effect when transitioned into FGO definitely needed a demerit. Otherwise, her NP would be so abusable, and you'd actually have a 12 guts Herc, except that Herc can actually have up to 120 guts if you want.

With that said, since this is FGO, I thought of making a connection to being "revived from death" as Iroha trying to "piece" back a broken spirit origin, so you have this debuff called Spirit Origin Unstable. Essentially, Servants revived are severely weakened due to their spirit origin recovering. Iroha is just screwing with the Thrones of Heroes at this point though...