I thought Mag had one Anti-Forest quest whichwas directed at Serenwilde and Serenwilde could summon a Spirit that stole power from them until said creatures were returned?

I was refering to giving Fae to Gorgulu and giving Moon Avatars to Gorgulu. We aren't sure if he still freaks out and eats all the other Demon Lords, as nobody has tried it since the first time he did that.

As far as I can remember, every org has a quest to cause notable damage to one other org (celest v Mag, seren v glom), while Magnagora has quests to harm every org (seren, glom and Celest), and then there's obviously the Soulforge.

I also would love to see something that actually harmed "nature" and not just the fae. You know, drains the forest of life energy and kills off a bunch of plants or something. Perhaps it would cause herbs to grow in that orgs demesnes at the cost of stopping them in "natural" terrain. Just -something- beyond the fae. As it stands the cities really have no reason at all to harm nature, and without that I just think the forest RP of "bad cities!" falls flat. Might just be me though.

We fed the Moon Avatars to Gorgulu, +5k power each time.

Though Gorgulu the Devourer of Souls is counted as among the Demon Lords of Nil, there is nothing about this monstrosity that hints at having an intellect, at least not one that is commonly understood as sentient. Also known as the Mouth of a Thousand Hungers, Gorgulu is a seething, amorphous mass that surges with corruption, filth and tainted putrescence. There always seems to be mouths of various sizes and species that form and salivate upon the inchoate blob that is Gorgulu. The mouths are fed by appendages that grow from the slime and pus, often appearing as tentacles or giant tongues, but sometimes as fully formed humanoids connected to Gorgulu by a cord, like half-aborted miscarriages.
A matronly woman's head sticks out on a sinuous neck.
A young maid's head sticks out on a sinuous neck.
Gorgulu the Devourer of Souls almost glows with nearly god-like power.
He weighs about 4093 pounds.
He is loyal to the Demon Lords of Nil.
You cannot see what Gorgulu the Devourer of Souls is holding.

I also would love to see something that actually harmed "nature" and not just the fae. You know, drains the forest of life energy and kills off a bunch of plants or something. Perhaps it would cause herbs to grow in that orgs demesnes at the cost of stopping them in "natural" terrain. Just -something- beyond the fae. As it stands the cities really have no reason at all to harm nature, and without that I just think the forest RP of "bad cities!" falls flat. Might just be me though.

As far as I can remember, every org has a quest to cause notable damage to one other org (celest v Mag, seren v glom), while Magnagora has quests to harm every org (seren, glom and Celest), and then there's obviously the Soulforge.

I don't know about the Glom vs Seren ones, but are you talking about the Ship of the Dead/Marilynth quest? I don't think they cause any actual damage to the org, but rather just prevent repairing damage, and create another barrier before cosmic guardians can get back their symbol.