Planar Lords as Elder Evils

The effects of said signs grow more pronounced the "closer" the Elder Evil gets to the world. In some cases, this is litteral proxcimity to the Earth (Ragnorra, Atropus), in other cases, "closer" is in terms of how close to success the groups working to free or awaken the Elder Evil are. A sign, at its most basic, is a magical effect that applies to the whole world.

Signs in the book are:
Blood Moon (agression and warfare, used by alien colonists to depopulate the Earth),
Dead Sun (the sun goes out, owned by a Far Realms creature kept imprisoned by the sun's light),
Eerie Weather (strong storms, some with suppernatural components like frogs or burning hail, owned by the chaos-beast Leviathan and the Anchient Baatoran Zargon (while it was nice to see the reference, Zargon's not so great)),
Infestation (swarms everywhere, owned by the Obyrlith Sertous and by Kyuss, the Worm that Walks)
Restless Dead (dead bodies rise as zombies, owned by Atropus),
Seal of Binding (the aformentioned fiery glyph, owned by some kind of Far Realms creature),
Twisted Life (corupt positive energy causes living and recently dead creatures to become aberitions, and destroys undead, owned by Ragnorra (if you've ever played the Illusion of Gaia, Ragnorra will sound real familiar)),
Alien Skies (changes to the stars and constelations disrupt arcane magic, unclaimed)
Appalling Fecundity (the cycle of life accelerates, unclaimed)
Dry Winds (water dries up, unclaimed)
Wet Winds (world floods, unclaimed)
and Horrid Blight (disease runs rampant, unclaimed)

For the 'Loths, I figure
The Oinoloth Mydianclarus: Horrid Blight
The Altraloth Anthraxus: Horrid Blight
The Altraloth Bubonix: Infestation (Rats and Plague)
The Altraloth Chloreix: ?Horrid Blight again?
The Altraloth Xengra: Dread Sun (oposite of Dead Sun, the sun grows brighter and scorches the earth)
The Altraloth Taba: Darkened Moon (Like Blood Moon, only increases treachery and betrayal)
The Altraloth Typus: Blood Moon
The Altraloth Celdric: Dry Winds
Helekainith, Keeper of the Tower Arcane: Alien Skies?

For the Demons:
Dagon: Eerie Weather (Acid-like rains)
Demogorgon: world wide Dark Visiting Anathmic power (a second kind of Elder Evil power. Dark visiting causes disturbing dreams which prevent rest)
Grazzt: Negative Energy Infusion (Water turns to Salt, and Fire refuses to do anything more than smolder slowly (Ash))
Juiblex: Infestation (Slimes)
Kostchtchie: Dead Sun
Malcanthect: ?
Obox-Ob: Twisted Life (turns living things to Insectoid Aberations)
Orcus: Restless Dead (of course)
Pale Night: Infestation (lesser demons)
Pazuzu: Eerie Weather (Windstorms)
Yeenoghu: ?
Zuzztmoy: Infestation (Fungus), or Horrid Blight (Decay)

For the Devils:
Mostly Blood Moon type effects that encourage their respective Tyranies
Leviathan: Wet Winds
Baalzebul: Appalling Industry (cycle of construction and deterioration of manufactured things accelerates)
Mephistopheles: Dead Sun (of course)
Asmodeus: Seal of Binding, Infestation (devils) (both)