Board Thread:General Discussion/@comment-26006155-20160613103837/@comment-26006155-20160617162112

Rifqitheflipper wrote: BlackfootFerret wrote:

...why Omega Flowey and Asriel DON'T act like Amalgamates, even though technically they should... That's because Flowey is a  soulless vessel, not a  monster ​, he wouldn't melt like the amalgamates Actually I have a theory about that too. See my big post about the Amalgamates/Fallen Down Monsters being the victims of having their souls stolen by someone two posts above.

Alphys only (knowingly?) injects Determination into the Fallen Down monsters, who she doesn't realize lack the souls that most monsters possess, so when she sees the horrible effect Determination has on these monsters, and how they melt together so easily, she thinks this is the normal effect Determination has on monsters.

But she's forgotten the critical and only member of the Control Group: Undyne.

It's very clear in the game from both Undyne's neutral death and her super-saiyan genocide rebirth as Undyne the Undying that Undyne has Determination inside her. We can argue about how she got it, whether natural, or from the pink goop Alphys feeds her and tells her is ice cream.. but I think we can all agree than Undyne got Determinaton, somehow.

And what does Determinaton do to Undyne? .. seemingly very little. She's had it for a long time, and if anything it seems to have made her much stronger than most monsters. She's clearly touched other monsters like Monster Kid, and hasn't merged or melted with them. She picks Frisk up by the head and jumps across the room, depositing him by the kitchen counter, showing amazing strength for someone who's actually almost a stick-figure in build. It's only after you hit her again, and Again, and AGAIN that finally she starts to show the telltale signs of Determination Melting, and finally, very relucantly, dies.

Undyne is a monster with a soul, and Determination only served to make her super-hardcore. This may actually be the usual effect Determination has on monsters, since Alphys doesn't know her Fallen Down specimins are very different from the norm. Only something very weak would succumb to Determination Melting so easily

I actually think that Amalgamates and Ghosts have a lot in common in Undertale. They're both basically invicible to attack, the both can shapeshift, and they're both represented as White. We know that most ghosts have souls though, as in Mettaton's case, so his/her cousin Napstablook would have one too. Blooky is a singular entity that isn't visibly falling apart, so he clearly has somethign the Amalgamates lack.