A mind flayer decides to insert a illithid tadpole into a troll's head.

The tadpole begins to devour the troll's brain.

The troll's brain regenerates.

The tadpole grows in size - but the troll's brain isn't losing mass.

At the same time, the troll's immune system is undoubtedly trying to kill the tadpole. But illithids are probably used to this sort of thing.

So...

What do you think we wind up with?

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