Cadfan said:
I don't know, I can think of ways that an ooze breath weapon might push you. Maybe its a huge horked up blob of goo that just bowls you over. I guess we'll find out what it really does soon enough, but there are ways it could make sense.
Sure, I've got no real problem with it making sense (in theory). The reason I'm unenthusiastic is because, amongst creatures known primarily for their ability to spit stuff out of their mouths, horking up snotballs is not exactly something that inspires.
"I can shoot flames!"
"I can blast lightning!"
"I can squirt acid!"
"I launch sub-zero frost!"
"ACHOO!"
Though I suppose "Black Dragon with a cold" might describe half white/half black dragon, which would be grey, and combining cold and acid might produce mucous....
....but still, I can't imagine ever really wanting to use a mucous breath weapon on a dragon. On an oozemaster, sure. On a demon or devil, maybe. On a victim of some zombie rotting plague, even better. On a dragon it just seems very silly.
But who knows. I'll have to see it before I expose it to my Permian Extinction level persnickitty criticism officially.

For now, it just does not bode well.