Jack IV: Little Dude, Giant Twerp
The Danger Gang is awakened in the wee hours by the approach of a carrier gryphon who bears a peremptory message from Jack IV, hereditary monarch of the Castle in the Clouds. He's an ungracious host, and pretty much twerpiest of the twerps--his giant subjects' sycophantry seems born of fear rather than genuine admiration...likely due to the giant-killing sword bequeathed to him by his great-grandfather of beanstalk fame. He also seems to know things he shouldn't, like the names of the party. And after a half-hearted tour guided by a towering gentleman named Humphrey, the DG accepts a ride down from the clouds in big ol' baskets carried on a yoke by a levitation giant, only to be DROPPED still 200 feet above the ground. The nerve!! Zombres' quick teleport and Arben's wind dagger manage to save the day (though there's still some damage).
One impossible task no closer to completion, they decide to pursue another--finding the indestructible cup of Llyr son of Llyrion, tracing its path from its last known whereabouts in the ash grove of Chibbyr Unjin on the Isle of Man. Luckily (or not, since it's got to be done eventually) there are no run-ins with aqua-boars on the way, though they do run into some friendly Norsemen during a rest stop on the Isle of Mona. The grove itself features a healing well with an arduous process involving sucking water through your clothes and then tying a strip to a tree, thereupon to maybe be healed when the cloth rots and falls to the ground, as well as a crazy-eyed hermit-y type called Urig who's seriously racist against elves (including half-elf Marcella, who's distinctly uncomfortable in a location that it turns out is instant death for elves). He tells them that the Llyr family left with their cup and moved to Dyfed in Wales, where they built a castle--last seen after a lady called Cigfa went into it and it disappeared, likely taking the cup with it. Well, at least that's a next step.