Ruddy Spire is a type of sprawler fungus which relies on Glow Rain to germinate and spread across Jhoutai. It is infamous for tinging glow clouds red, and for its rapid and deadly growth.
If the sky be blue,
then onward with you;
If the sky be red,
you best hide or you're dead.
Released by Sunbursts and electrical storms, the spores of the Ruddy Spire are swept up into the cloud layer, where they consume the spores of other sprawlers and germinate, taking on a red glow.
Wherever these glowing seedlings land, they rapidly grow up to 6 inches in the first hour. This isn't dangerous to the prepared, but if you are caught in a storm of it, the liklihood of survival is low.
Once settled, the Ruddy Spire grows slowly again, usually feeding on whatever poor creature it originally killed on arrival. It grows 1-2 meter stalks covered in spores, and waits for the next Sunburst.
If these spores are rained on by blue rain, they will burst open and activate once more, splashing the area on Ruddy Spire spores.