Silk is an NPC located in Act 2 and Act 7.
Claiming to be a great hunter (and proudly wearing some of his apparent trophies), Silk seems to be known more for his stories and songs instead. There seem to be various opinions as to their truthfulness, but it appears clear they are generally embellished at best, and improbable at worst.
Lore
Similarly to Greust, it is unclear what is Silk's exact role in the Encampment, but apparently his primary profession is hunting, and there is obviously a strong and tense rivarly (with mutual accusations of lies and cowardice) between them. However, he seems to greatly prefer less mundane activities instead, such as singing songs and telling stories - as Eramir puts it, Silk "would make a fine bard", and that the Encampment "would have nothing to fear with Silk among us", if a fraction of his stories were true.
He appears to be very sure of himself also in other matters ("females like to do things for Silk"). And while it can never be known whether his high opinion of himself is justified or how many of his stories are true, it appears there is sometimes at least a grain of truth in them, as can be seen in the quest Sharp and Cruel.
Yeena seems to hold a much more favourable view of him, however - claiming Silk observes and sees much more than he says, and that there is truth in his stories for those who listen carefully.
Behind the scenes
Silk is voiced by a local New Zealand actor, Sam Fraser.