Whitehearth

House Cannith's ancestral forgehold and primary R&D center.

The hearth is both the fireside and blast furnace, this facility is also names "white" as the blank sheet to draw ideas upon or the untrodden snow field waiting to be explored. Experimental magic items were conceived and developed here with project demonstrations onsite for house leadership. New ideas are the primary product of this facility and it is the other sites' responsibilities for their individual fields.

Cabblen Hall

Arms and armor development.

"Cabblen" is roughly "cabble-en" which could be "of cabble" and cabble (metallurgy) itself is a form of scabble (to shape or dress stone), from scapple (to dress timber). Thus, Cabblen Hall is devoted to House Cannith's efforts with metals, and during the Last War, that easily translates into weapons, armor, shields, production, enhancement, and associated magics.

Tallis

Magical clothing.

Tallis is the actual name of the Jewish garment worn over the shoulders like a shawl. For your adventurers and those who can afford them, this would include your bracers of armor, cloak of resistance, gauntlets of ogre power, and your hat of disguise from the core materials, but also darkweave and glamerweave products could have been created here first.

Kronu Hall

Higher order wondrous items.

Kronu apparently comes from the late-1800's auxillary language of Esperanto, and is a derivative of the Latin corona meaning "wreath," or "crown" in its usage and derivatives. Using that we have a signifying term for items of great power and prominence such as rings, rods (described as scepter-like), the all-powerful magic staff, and major items like the various helms.

Blackhearth

Constructs.

As Whitehearth is new concept R&D, Blackhearth was the primary production facility of the house. During the course of the Last War it became the focal point for all warforged production, including units, components as prior to the development of the 'forged it was the center of construct R&D. Alongside its creation forge are wings dedicated to homunculi and constructs including the clockwork steed, iron defender, and shield guardian.

Redhearth

Dragonshards.

As long as we are going color themed for the other production sites, reds and pinks are the color hues of all Eberron dragonshards and why they are called bloodstones. Though of course there was R&D into Khyber and Siberys shards as well as production of items incorporating them, Eberron dragonshards have the greatest affinity for arcane magic and House Cannith looked to create and produce as many items with them as possible. Accomplishments of Redhearth include Aureon's spellshard, eternal wands, and everbright lanterns, as well as incorporating bloodstones into other wondrous items. Let's face it, who wants another diplomatic incident with a house artificer wearing a hand of the mage accidentally offending the Aereni ambassador?

http://keith-baker.com/ifaq-transportation/

How far in the future do you pitch House Orien demiplane transportation? Could it be introduced tomorrow or is it still a few years away in your mind?

To clarify: Demiplanes are small pockets of reality that connected to the material plane in Khyber. These connections defy normal space, so you could find an entrance to the daelkyr Belashyrra’s prison demiplane in the Shadow Marches, walk for a mile, and then emerge in Xen’drik — a trip that would have taken days or weeks by other methods. It’s been suggested that House Orien would love to find a way to harness this effect, creating a system of transplanar highways.

The people of the Five Nations know almost nothing about demiplanes. The idea of Orien’s interest assumes that the house has stumbled upon a demiplane, confirmed that it is a spatial shortcut, and wants to make use of it. My assumption is that they are working on creating artificial portals, because most existing portals won’t be much use; they can’t do much with a random portal out in the middle of the Shadow Marches. But they could develop an eldritch machine that uses the power of the Mark of Passage (hence, Orien) to rip a path into a demiplane.

With all that in mind, how close is that to being functional? NOT AT ALL. First consider that the whole thing is highly experimental. Consider also that they need to figure out how to get passengers safely through the demiplane. It may be a shortcut, but you still may have to travel for a mile across Belashyrra’s prison to reach the exit point; how are they doing that?. What dangers might they face? Which reaches the main point: in my Eberron, ORIEN HAS NO IDEA WHAT THEY ARE MESSING WITH. This is entirely like Weyland-Yutani discovering a xenomorph and saying “I’ll bet we can use that.” They don’t KNOW that they are opening portals into, for example, daelkyr prisons or overlord’s hearts. I expect that these efforts will have DISASTROUS CONSEQUENCES. So in my campaign, this isn’t a service you can actually expect to WORK any time soon; it’s something that serves to drive ADVENTURES, as adventurers are hired to explore demiplanes, or accompany Orien pathfinders, or to deal with the horrors the house accidentally released into Passage by opening portals best left closed.

The house experiments with demiplanes, and inadvertently opens portals to a Daelkyr's domain. Madness leaks out.

thoughts:

• maybe instead the party learns about early tests and tries to stop it?
• maybe it's a rogue scion who takes the tech and goes mad from it? (Dyrrn corrupts?)
• maybe the party ends up in some far-flung isle like Xen'drik?

Piecing together a few existing adventures (modified):

• Forgotten Relics (https://www.dndbeyond.com/sources/erftlw/building-eberron-adventures-forgotten-relics)
  • party (unknowingly) meets a warforged follower of LoB.
  • party investigates "old sharn" to find some ruins of a Cannith forge.
  • party follows leads to confront the warforged.
  • warforged escapes, and players claim the loot from the forge:
    • a dormant docent
    • some rough notes about docent nodes
• Forgotten Forge (3e source book)
  • party witnesses a murder of an old man perpetrated by a warforged
  • party finds a journal on the man
  • party meets Cannith scion, who sends them deep under sharn looking for a sealed forge in search of templates
  • party finds the forge and the templates
  • party is ambushed by the warforged on the way out
    • warforged can die or not - w/e
  • the pattern part of a set which unlock the (re)creation of docent nodes
    • docent nodes are required to build warforged colossi.

There are more adventures written after Forgotten Forge:

• Shadows of the Last War
• Whispers of the Vampire's Blade
• Grasp of the Emerald Claw

• who did he make a deal with?
  • dyrrn the corruptor could work well.
    • dyrrn could eventually give him an aberrant dragonmark?