Issilar was getting a lot out of this, so he carried on, and travelled with them to Saventh-Yi!!
He's kept up the disguise, setting up camp with them, and "helped" with the initial over-flight exploration (the party is well-up on flight abilities), with some "interesting" opinions:
* "the charau-ka are annoying pests" - "let's wipe them"
* "the serpent-folk are clearly too dangerous to tackle" - "let's leave them alone" (err, while I take command and build them up!)
* "the humans in the Sacred Serpent zone are clearly worshipping demons(!) and innately hostile" - "don't negotiate" and "be prepared to go in wands blazing"(!) [this latter one may break the illusion, once the PCs get there - *if* they actually talk.]
They haven't actually remembered to question his motives, or habits of disappearing, of not actually contributing usefully in battles (being at the back and "dithering"), and his vagueness about which Faction he's from ("a party of adventurers like yourselves; but our rendezvous has been and gone, and I guess they didn't make it... Sigh (pathetically)[Bluff]")
so, they've clear the Mercantile District.Issilar has been allowed to go off doing his own thing - the party don't expect NPCs to come with them and prefer to be allowed their own battles. He's now told them of the Rakshasa ruling the Serpent folk, and suggested a joint battle-plan: the PCs annoy the Charau'Ka with enough illusory Serpent folk that they attack across the bridge, then while the main Serpent folk are distracted, the PCs kill the Rakshasa, and Issilar will then "use his shape-changing magic" and "make himself look like the Serpent folk" and use his Charm spells to convince them to accept him as their leader. So far the party are buying it hook, line and sinker.
They are planning to restore the deposed leader of the Serpent Folk.
Next thing we know, they'll be telling him all about the Severed God and the plot line, and have him ""helping" them!