Making of an Arctic Sea

The northeastern part of Midrêth is a dangerous area for travelers.  There is the Cube of Infinity, sometimes used to terminate extremely dangerous criminals.  Around this unimaginably large cube is the Forbidden Sea.  In these waters, you risk being lost to freak tidal waves.  Beyond both of these is

Silfergath, making his own prison

the Prison Continent, more commonly known as Denerra.  During the Dawn War, this continent was used to imprison primordials and some of their powerful minions.    One of those imprisoned here was a icy monstrosity named Silfergath.

Silfergath was not a thinker, he was made by Thyrm and others to serve as a living war machine.  Twice he ended up creating his own
icy prison.  His final resting place is in the cold depths of Nautrek.  This sea changed when Silfergath became entombed in its depths.  It went from being a temperate ocean to be an arctic one.

Pinnacle of Chaos

boots of the Horde of Chaos

The Pinnacle of Chaos is sited in a vault beneath Moghorob.  Long ago, a wild mage tried to enhance her power by tapping into the Elemental Chaos.  In so doing, she ended up getting herself killed, her sister killed, and opened a rift between Limbo and Bal-Kriav.  A black slaadi came through named Ushgergoon.  He would go on to form the empire of Neenth-Theen and later be a leading cause of the Chaos War.

Some of the heroes of Squad X7E may recall this place.  They fooled around with the Pinnacle of Chaos while on the Mine Splash mission.  Then, they were still wet behind the ears, and had no inklings of the device they were tampering with.

How does it all fit together?  The Entropy Fragments taken from the Pinnacle of Chaos were used in making the Entropy Arch opened at Sapthiladân.  The same one that you, Trauma Squad, are supposed to destroy.

Who is calling dibs on Oblivion?  First though, you must pry it from the dead hands Ushgergoon.

One Head Becomes Two

Ladneg the lemure and other insignificants

 
Demongorgon is a Prince of the Abyss, one of the more powerful, if not the most, of all the demon lords.  Many of the demon lords have been around a very long time.

Some time after the Dawn War, thousands, maybe
tens of thousands of years later, the gods and their angels warred with the demons.  They formed a special cadre of angels that fought the demons.  These angels became despoiled during their conflict with the demons, and would ultimately become fallen angels, and then devils, but that is another story.

The demon lords and devils have long histories, and the history of Ladneg talks about how Demogorgon nearly lost his head, and in the process became even mightier.