The only problem with that Frog Hero Badge from the Lost Sanctum is that while IT carries over to a NG+ run the UPGRADED Masamume IS required to even HAVE the MP lowering cost effect it doesn't even WORK with the Masamume you USE to KILL Magus in 600 AD on a NG+ run so Frog is still better off with a GOLD stud equipped still those off of the Fly/Eyeball enemies that drain your MP in the Black Omen I stole at least 6 more.