Mycelia

Mycelia is a secretive realm of sentient mushrooms behind The Fungal Wall, south-east of Creatis. In campaign 2 (1034 PC) Keso was drawn back to it through the dominant personality Lepiota. The network had been cut off from "the lands where the days are longer" by a corruption tied to the Shards of Obsidian. By campaign 4 (1047 PC), Creatis had spent thirty years absorbing Mycelia "into compliance".

Details

Lepiota

The Mushroomish woman is named Lepiota, she is not really an individual, but is a dominant personality within the collective.
To Keso it feels both alien and familiar to be here. She will lead the part to their "home" where the party can rest.

She will answer any questions

While chatting the party will hear a series of shreaks and low rumbles. SHe will explain that is the broken one and focus for a moment

A large section of the eastern wall of the cave is filled in with a kind of net of fungus people/mass this is where the Vernificium Dux was found, there are small shards in this area, and it is also where they have locked back the one. Unable to subdue him, they trap him in a vaporous slumber. They dare not pass through again as it reduced the whole each time.

A Large myconid corrupted with a fist sized chunk of obsidian in its head.

She will also explain that they are cut off from the lands where the days are longer, something has corrupted the growth, and they fear it will extend through the network to consume them. that is why they decided it was time to try and reach Keso, as Keso is not part of their network they are less likely to be corrupted should the corruption continue to make its way through the network.

Deep in the earth, where the days are longer and the water runs black.

She will show you a few that returned, disconnected from the network and partly turned to stone.

they will be

Some other mushroom personalities they might meet

Bolette, a plan looking mushroom person with slightly stoned eyes, will be tasked with helping the party get anything they need

Portabello , a big thick labourer , carries stuff about as requested

Slippery jack, a scout , a bit stealthy and watches the mountains reports back from the network

Morchella - a large group? of mushrooms that will spread out around the party should a dragon fly over.

In campaign 2

The party entered Mycelia in 1034: purple and pink, with mushrooms as people and houses, floating spores and wisps of light. Afterwards Keso's sense of the mycelial network was blocked. In his epilogue Keso built a giant mushroom tower up to 40,000 feet tall for walking mushrooms to live in.