Don't worry about the posts too much. Play your character. We all have our own style. And it was a good start.
Unless you have done a fair bit of reading, you wouldn't know it, but Roan actually has seen an amulet like this in action. Ulthok likes sticking his finger in strange places and recently died as we tried to enter the tower. Yet he is back and lively again thanks to his own amulet. Roan was there to see it. Most importantly, however, this doesn't really matter. So what if you didn't know it and included a comment about it in your post. It was color, and good color at that. Don't worry.
That isn't a problem. A problem is when you write, "Roan approaches the beholder and tries to tickle it." That might not have a gentle result.

