On a serious note, assuming the protoss have a stronger chin bone then a human, with a more pointed/narrow face, that's armor to protect someone from just upper cutting them and slamming the bone into their brain.
Alternatively, a stronger piece to hold their helmet in place, since most protoss have khydarin crystals in their helmets to help channel their psionic abilities.
seriously?
It is a voice modulator. Without it they sound like MIckey Mouse. They are mice originally. Mutagen changed them. Check Splinter:
See?
@Zolden: Go
What's this? Please, everyone knows that protoss are an alien version of ducks, the dog-face-mask is an undeniable proof of that.
.....
On a serious note, assuming the protoss have a stronger chin bone then a human, with a more pointed/narrow face, that's armor to protect someone from just upper cutting them and slamming the bone into their brain.
Alternatively, a stronger piece to hold their helmet in place, since most protoss have khydarin crystals in their helmets to help channel their psionic abilities.
It's a shiny thing that looks cool and that's about as much sense as the Protoss ever make.
Might be a chin strap.