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Description
if Frisk fill the ratings meter to 100% and "Defeats" Mettaton EX they unlock MTT key
If Frisk Defeats Mettaton Neo Heart they unlock Fallen star

Because Frisk can not travel to other worlds the keyblades that the unlock are based off of the deferent area in the underground. also depending on Frisks choice and actions the keyblades unlocked can be deferent. also the mercy state makes it easier to spare monsters by bosting the Mercy meter. The Mercy meter would only appear in a fight with monsters that would need to reach 80%-100% in order to spare a monster and a keyblades mercy state is add to the Mercy meter at the begin of a fight. The Mercy meter can go up or down depending on saying or doing certain things how ever damaging or harming a monster will always make the meter go down.

Description
if Frisk fill the ratings meter to 100% and "Defeats" Mettaton EX they unlock MTT key
If Frisk Defeats Mettaton Neo Heart they unlock Fallen star

Because Frisk can not travel to other worlds the keyblades that the unlock are based off of the deferent area in the underground. also depending on Frisks choice and actions the keyblades unlocked can be deferent. also the mercy state makes it easier to spare monsters by bosting the Mercy meter. The Mercy meter would only appear in a fight with monsters that would need to reach 80%-100% in order to spare a monster and a keyblades mercy state is add to the Mercy meter at the begin of a fight. The Mercy meter can go up or down depending on saying or doing certain things how ever damaging or harming a monster will always make the meter go down.