The Dragon
"What I meant was..." the Dragon searches for words. Some elements of philosophy do not carry well over language barriers, especially when one of the those languages is Draconic.**
"When there is a test of the soul, when your being is weighed on the scales, magic will not help you. There are magics that may make an evildoer seem righteous, but no magic will make such a being be righteous, that must come from oneself. Now this place, we have been here a long time, and still we do not understand it fully. Is it better to be Good, and thereby sooner embrace the power here, or Not, and try to resist it? But if you are prepared and anchored, you must come with me. You must be honest with yourself, if you feel yourself failing, make no show of excess will, there is no point to that."
The Dragon begins walking upstream, holding itself to a pace the others can follow easily.
Travelling upstream, you begin to feel what the Dragon was talking about. At first, it's just an appreciation of the land's beauty, and the uncanny way it helps you, as if it wants to make your life as pleasant as possible. No one trips, no one slips, or gets caught in thorns (though it seemed like the Goblins faced all of this.)
There's even a conveniently placed apricot tree when you are hungry.
And then a thought emerges: why, really, would anyone want to leave such a place? It's wonderful. You could be happy here, for the rest of your life... and if the Dragon was right that would be real happiness, and not an illusion of it.
And then another thought: Do you deserve it? Are you worthy of it? Have you earned this paradise?
For a while, these are just ideas... that come...and then come back with increasing frequency. But you can feel them getting stronger. It does not help that these two ideas conflict.
**They have over thirty words describing different kinds of scales. The language is filled with words denoting the age of a thing. Along with the language of the Treants, theirs is the only language that would use different words for Tree, Old Tree, Very Old Tree, and Really Really Ancient Tree.