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Undertale AU/OC Idea? - Soul Symbiotes + Parasites

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Soooooo I'm not sure if this counts as an idea for an OC, an original race, or an AU, but I liked the idea enough to share.

So basic idea is this - what if there are creatures that need to live within souls to survive?  Like, they're nothing but souls themselves, and they have no physical body to house their themselves in, so they make do with the souls of humans and monsters, burrowing inside them and taking shelter within the culmination of peoples' beings?  And some of them are more harmful than others.

The symbiotes burrow into peoples' souls and live there for the duration of the host's natural lifespan.  Though their initial entrance can cause permanent damage to the soul (permanently lowered HP, lowered magic stats, etc.), the symbiote makes up for it by granting their host some advantage - the ability to use magic, for human hosts, or some new status effect or stat boost for pre-existing skills in monsters.

The parasites, on the other hand, eat their hosts' souls from the inside out.  This can take anywhere from hours to years, and the hosts eventually go into a coma or fall down, depending on the species.  Even for humans, when the soul has been eaten away completely it takes only a short time for the body to die.

Luckily, the parasites are rare, and when they do turn up, they usually target strong human souls, which means that the host has some time to live.

This particular being is a symbiote, housed within a monster soul and granting a magical status effect that turns up as a purple color in battle - I haven't decided whether that means this is Muffet's soul or Sans's soul or some monster OC, but hey, I'll figure that later if I do more with this idea.

Undertale is (C) Toby Fox

These soul symbiotes and parasites are (C) Wingd1
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