The 3 Valleys

Discription and history
** the general map found over in The West, might prove helpful here.

Past the Fen are 3 valleys.situated between the 4 mountain ranges mountains. the valleys have mostly the same ecosystem and thematic values. scattered around the valleys are a variety of old and crumbling ruins of ancient research facilities. even now several forever after the fall of the dwarfs, their architecture stands, at least partially. This is due both to incredible engineering, and magical re-enforcement, linking the full size structures to carefully preserved models in The Achive( a location under the cliff)[think voodoo building]

magical beast roam the forests, and even the deeper parts of the rivers.

There is some particular ecology, while there are several brands of herbivores, and more then a few interesting grasses, there is a rather varied  collection of primary and secondary predators in the valleys. However the apex predators are found in the mountains, and they mostly enter the valley periodically to feed. The primary exceptions to this rule are the rare a dangerous dinosaurs.

When a creature died, 10-30 minutes later a shambling mound will approach it, engulf it, and begin the process of breaking it own. These mounds are non hostile, but will attempt to break down anything that is fed to it.

Locations
Facilities so far discovered:

The library

The observatory

Sighted creatures
hell hound (with a hyena pack)

shambling mounds

signs of Mud Mephit,

Chimera (in The Mountians)

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creature that are in the environment(non exhaustive)

T-Rex

Trolls(-2 to int, making them non intelligent)

Invisibly stalkers (These should be rather rarer as they are more difficult to deal with.)

General Methodology
Don't hesitate to get creative with the kinds of research being done, and what kinds of facilities might have existed to study in inter planar portals and a new world if an incredibly advanced magi-science society found a new world with new rules of physics and magic. leave things in ruins, but give ample clues about what they were used for.

Monsters you might expect to see here range from CR 3(as pack monsters) to CR 10( lone less agressive monsters) because of the generations of magical experimentation that happened originally there might be variants of normal magical creatures, such as a hell hound with a cold or psychic attribute instead of fire, nor less magical creatures having magical abilities. If you are adjusting a creature to magic, consider a level 1 spell like effect, with are 2-4 recharge, or a level 2 Spell like effect with a 4-7 recharge.