What if the asari visited earth and for some reason that’s how the Greeks got the letter Omega?
But let’s take it a bit further,
Asari have tentacles for heads, and that’s freaky. I mean Shepard wants to bone a tentacle-headed nerd and that’s great, but to some Greek from centuries ago, pretty freaky.
They’d be scared, and semi-rigid cartilage tentacles being what they are, they’d look much more sinister.
Like snakes or something.
Greeks get scared, they get threatened, maybe they get violent.
Asari get threatened, maybe they use stasis. Greeks freeze in place, like a statue.