Sometimes, the skies of Spellfire are not as safe as they could seem. There glide not only dangerous flyers but also some dangerous clouds. And these clouds are specifically known as the Deadly Clouds.
The first time that these clouds were noticed, they immediately differed from regular ones. There was something strange about them - something that made a creature who looked at them feel uncomfortable. But no one paid much attention to it until one day, reports began to circulate of several flyers found dead. And those flyers were known for flying through or near these mysterious clouds.
As it later turned out, these deadly clouds emitted poisonous gases that were deadly to any living creature that flew through them or even came close enough to smell the deadly vapors. As word of this new threat spread, many Spellfire flyers became concerned and even decided to stay on the ground for a while.
While there is no official protection confirmed, it's best to avoid clouds that raise even the slightest concern.