Devil Seed (Mjthos)

Devil Seeds are the product of the experimentation on Devil Fruits by ????? during the Void Century.

Introduction
Devil Seeds are best understood as watered down Devil fruits, they allow their consumers to utilize devil fruit like abilities but in very specific ways and circumstances. A Devil seed enables its consumers to utilize a single function of a devil fruit based on the abilities of the devil fruit they are based on.

It's possible to consume multiple Devil Seeds of the same "species" to further unlock techniques of the specific fruit but doing so requires a certain degree of physicality as doing so is often lethal.

Consuming devil seeds of two distinct species and classifications is extremely risky and almost always leads to death, any and all attempts of consuming 3 different ones have ended in death.

Cultivation
Devil seeds are relatively easy to produce as they grow inside "artificial devil fruits", the key difference between them and artificial devil fruits is that even failed specimen contain usable devil seeds inside.

Logia
Logia seeds are vastly different from normal logias in that they allow their users to control the elements around them and sometimes produce them but only in specific ways. There isnt a single logia seed that can turn a person into an element.

Zoan
Zoan seeds bestow upon their consumers a single ability associated with a animal. Zoan seeds are vastly different from zoan fruits in that they are divided into Groups not species, a Bug Seed lets you have the ability of any bug. They also do not enable anyone to shape shift.

Paramecia
For some unknown reason Paramecia seeds do not appear to exist. The only known reason for this is the rumor that ????? never figured out how to crack the paramecia category.

Side effects
Much like devil fruits they can be cancelled out with kairoseki or sea water however the side-effects are greatly diminished.