I have started to foreshadow this adventure, but my PCs are level 8 right now.....the campaign I'm running started out as "stargate for D&D" but is morphing into finding the many sources of magic (one of which is the intersection of the world with other planes). They have already been to Phlan, and will likely be going back. They have heard the name of the BBEG. And, one of them is carrying an axe that is an artifact he has not yet been able to "activate", but I'm pretty sure when some barbarians come a'raiding, something will happen.....