Haha nice pun... It's still pretty vague in my head, I guess. That's sort of why I am playing a character on the rp forums that is a Silvanus, because thats the best way for me to work out these sort of kinks. Although you bring up good questions, so I'll answer them as best I can at this point.
Interaction: There is almost never more than one Silvanus in any forest, unless it is a forest that stretches continuously for miles upon miles. They are constructed, if you will, like I said, from a small bit of essence from just about everything in the forest, rather than just from the spirit of a single tree, like a dryad ((I believe this answers another question as well)).
Awareness of others: As I said, there are very very few of them, and they are widely spaced, so there is very little interaction. Also, like I said, some of them arent even aware of what THEY are, much less aware of others of their kind.
War: Same reason as the last two. In a time of war against the forest, or in case the forest were to take sides in a dispute between say, humans and elves or humans and another group of huamns, the Silvanus of that forest would be a sort of a general, with their ability to link themseleves on a certainl level with every natural creature born in the forest. I think I would describe them as a kind of avatar for the collective conciousness of the forest
As for the thing about advisors, it would most likely be in terms of a dispute over lands of the forest claimed by various groups. The forest, and therefore the silvanus, would remain largely neutral in that sort of thing, but they would usually attempt to avoid a war where possible - war is rarely kind to the land upon which it is fought.
Finally, they can leave the forest because that is half the point of their existance. They are not necessarily an extension of a spirit, but an independant collection of bits of spirits. They have a very deep connection to the forest, but they CAN live without it.. Rarely do they stray from their forest, but they ARE able to leave
Also, I was partially deliberate in leaving some things open to interperetation - I dont think that the roleplay should be too restrictive on things like this, if the GM wants to have his own interpretation of the Silvani, I encourage that. Go to Comment
The Silvani Lifeforms (Intelligent Species)
Loud war-screams shatter the silence of the forest. The party, scrambling quickly over the thick forest floor, are ambushed by savage elves, dropping down from the trees and rock outcroppings. Their hair is cropped into mohawks and their arms are striped with tattoos.
They attack, and scalp unfortunate victims.