Alghaster |
I'm a bit late to the party, but for my campaign I wrote a short adventure in Kaer Maga. Let's face it - the beginning of History of Ashes is completely bereft of story line. You just sort of random encounter all the way from Harse to Thousand Bones. Kaer Maga is a great setting to have a side adventure or two. Personally I went the route of the Mantis trying to assassinate party members while they were there, which culminated in a Mantis attack that was in the flavor of Marvel Comic's The Hand organization - essentially a mini-game of them escaping Kaer Maga due to overwhelming waves of Mantis assassins.
I also incorporated some reading about the ecology of random encounter creatures into their journeys. My party was plagued by a pride of Chimera. Started with one random encounter with three chimera, but then their pride sought vengeance. The pride was led by a matriarch with a Vrock template that genuinely gave them a run for their money with her pride members. It was sort of like a miniboss fight. Fun stuff.