All dark magic has a price and the magic that Angel used to solidify Sahjhan does too.  Slug like creatures are appearing in the hotel.  When the crawl inside a potential customer, he flees and begins drinking mass quantities of liquids before turning to powder.  While trying to contain the creatures to the hotel, Gunn goes to Wesley for help.  He helps because Fred is the one in danger but makes it plain that he doesn't ever want to see any of the group again.  It is revealed that the slugs are escaping from an even greater danger, the Destoyer.  While fighting the slugs, an aspect of Cordy's new powers as a quasi-demon manifests.