Orcs creation theory

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Originally Posted by Ghazi

An elf.

Was she 'just' an elf? Somehow Lúthien's genes are a little different from the rest of the First or Second born.

But let's work with that. Melian wasn't an elf, but obviously made herself appear - physically, mechanically - enough like an elf to beget a child. Take some other maia that's not so nice. Have this evil being take a form enough like an elf to create offspring, but not like an elf in appearance due to its more evil nature. What could we get from that union?

In the case mentioned above, and if the logic holds, the Maiar in question would have to assume a compatible form (ent, elf, etc.), in order to mate, and therefore would produce an expected offspring (ent, elf, etc.).

See above. Mate the offspring of multiple elf-evil maia unions, select for the nastier ones; mate them to each other; repeat as necessary.