This is a very cinematic version of schizophrenia, and far more coherent and... constructive... than the usual thing. Also, more benevolent by a large margin.
Thus, you might consider avoid calling it such.
Alas, the writing is rather charming, and the character very useable in a game.
My thoughts? Call it simply madness, not by a diagnosis which it does not fit.
I thought the intro story was fantastic, it was a little inaccessable written as transcript on sound rather than a discription of sound and at time confusing, but I think that was part of its strength. For the often banal and direct world of roleplaying, most creative risks in write up of support piece such as the intro rarely play off. I think it worked in this case.
Running this character as NPC could also present quite a challenge. In roleplaying it is difficult as a PC or a GM running an NPC to play a character with a great deal of internal dialog or conflict. But the details you provide would be a great aid in trying to run such a character. Roleplaying is already surreal, we you bring in more surreal stuff into you threaten to tip the balance away from something the whole group can hold on to. But the amount of details you have the character in this post would be very help in bringing such as unhinged character into the game. the irony is that it easier to bring vague and ephemerial stuff into the game when you have the details of the vague and ephemerial stuff down pat.
A wicked idea, a twisted man finds victims and allows them to launguish and then perish of ether poisoning, then he renders the fat from their bodies creating ethertallow that is tainted with both necromantic resonance. These ghastly candles function exactly like ethertallow, but anything in the presence of the flame will not heal, plants will not grow, and the like.
I read this line----"But there are those creatures, the abberations, that have been tainted by the Ether, and may be drawn to it's scent"---and immediately picture a stodgy old wizard, deep in his cups, sitting at his cluttered desk, inside his snug little demesne, mumbling and examining glyphs in some book. It is the dead of winter. A blizzard rages outside. His half-dozen lit ethertallow candles flicker due to the drafts. Unbeknownst to the wizard, some kind of bizarre, other-worldly abomination is at his window, peeking inside, its ragged breathing drowned out by the wind...
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As Strolen mentions, a few side effects would be swell, and Scrasamax's idea rocks!
Roll Will save or die :)
I find the symbiosis aspect neat; the "uprooting and sitting on the victim" darkly comical. Which is a good thing.
You really could add a paragraph about nefarious uses of the fruit - perhaps people without a sense of smell are recruited to collect the fungus?
Finally, a question: why this name? I get the "sylvan" part...
(a solid 4, btw)