Giant Spoils

The stronghold is a cluttered mess throughout most of it, the discarded remains of the original holders scattered throughout. The main room has been swept clean of most of the detritus, and used by the fire giants as their living area. The courtyard is overgrown with weeds and small scrub brush, mostly burnt and dug up by the hell hounds.
Among the wreck of human habitation, careful search will reveal a few items of interest. This includes a staff of swarming insects, an onyx dog, and a ring of spell storing. Searching the tower as well, the characters will recover 6 gems worth 100 gp each. These have been squirreled away by the orcs among their possessions.
There is also some correspondence among the orcs' belongings detailing payment for the raid on Garrett's Junction. There is nothing else of interest among their belongings. There is a pantry of sorts in the tower, with a week's supply of rations recoverable.
Concealed inside the main room of the stronghold, where the fire giants were living, is a locked chest. It is beneath a false floor, and can be found by someone actively searching the room on a perception DC20. Inside the small cupboard is the locked chest, a folded parchment, and a coin purse with 350 gp. The chest is locked (DC18 to pick), and contains a bright green gem in a gold setting. There is nothing to indicate its value or function. If someone makes an arcana check (DC16), they will detect an aura of control from the stone, but nothing more specific. The gem is a controlling stone from a green slaad.
The parchment can be unfolded to reveal a map with a trail marked across it. Imogene recognizes the map as referencing the oozing quagmire flowing down from the volcano toward Aron's Bowl. Otherwise, a survival (DC18) check could reveal the same. If anyone speaks giant, they can transcribe the notations on the scroll as directions revealing safe passage through the morass of the swamp. A survival roll of 20 or more could infer the same.
The parchment is a map of the safe trail through the swamp to the slaadi village. The green gem is the controlling gem for the green slaad in the village. There are a number of red and blue slaadi that can be encountered in the wild, with a dozen in the village, led by a green slaad. While slaadi are not generally very organized, these have a working allegiance with the dragon to restrict and dissuade passage to the volcano through the swamp. For this reason, access to the volcano from this area is possible without alerting the dragon. The party has a chance of dealing with the slaadi and reaching the limits of the dragon's lair without directly alerting it to their approach.