Huh, I never noticed this before...

[Medi]

Atop the final boss's main head, there is another head. Anyone have an idea of what it's supposed to be or represent?

I kept this post relatively spoiler-free

[atlanteay]

i think it's the (SPOILER)venat that's fused with Vayne

[Darkja]

^That'd be my guess too.
/

[Anno Domini]

that's what the guide says, but i have never really seen the final boss

[Renmiri]

Ditto.

Ugly SOB!