In the Attack on Stormreach F2P and P2P chains we're given a taste of the Droaam forces and the Daughters of Sora-kell. However after having driven the Droaam off the Coin Lords appear to just go back to business as usual. What I am suggesting here is that the Coin Lords mount a full scale attack on Droaam over the course of 10 quests and 1 raid. The 8 quests would be flagging material for the raid, the first 3 would be devoted to getting the Great houses on side with the invasion. With the object of the chain being to break the hold the Daughters of Sora-kell have on Droaam allowing it plunge back into chaos.
After the great houses are on side the next quest would be sailing to Droaam, "Precious Cargo" showed that Airship Warfare is mechanically possible in game though it is more likely that the invasion would sail, due to the vast numbers required to invade an entire nation, the job here would to defend the fleet from pirates (early on) and then subsequently Droaam ships as the United Stormreach Army attempts to land its ships in Droaam territory.
Once the fleet has successfully landed it would meet the reconnaissance group on one of the beaches here forming the public zone of a military camp from which the rest of the quest chain would play out.
The object of the next four quests would be to get certain Monstrous races to work as allies to the invasion force, to assassinate Droaam military commanders and to turn certain races against one another.
The final raid would be a siege on "The Great Crag" Capitol city of Droaam, the main objectives for the raid group would be to open the gates to the city to allow the invading force inside, destroy key defensive positions and finally to confront the Daughters of Sora-kell as the raids boss fight, The adventurers would fight the three hags all at once while simultaneously fending off waves of Ogres and Giants.
This is my proposal for an Attack on Droaam style pack/expansion, the first section pertaining to Uniting the houses and sailing to Droaam could be dropped if the Devs wanted to make it just a quest pack as opposed to an expansion.
In regards to Raid Loot Wepons similar in style and effect to the original chain only made Epic could work well, as could wepons/items pertaining to specific Monster races: An Ogre Maul, an Orcish Great axe, a Gnoll Bow, a Harpy Necklace/ring w/e just as examples.