My Headcanon as to why the Clan haven't descended upon Bet like loot-devouring locusts yet. Bugger all to do with the actual canon of the fic, but it won't expel itself from my brain.
It was widely acknowledged that Clan Leader Dor'han was a rather lazy fellow. Some even poked him by calling him slothful. He himself admitted that he rarely left the Dojo for more than an occasional loot run because he "couldn't be bothered to fight such weak enemies." This wasn't due to a lack of skill, though. He had Orokin weapons and Warframes galore, looted from the depths of the Void. He had mastered most of the weapons available in the Origin System, killing thousands of Grineer in the process. He had fought through the hellscapes of Void and Infestation. He was called lazy because he'd earned it, dammit!
The major reason he was called lazy, however, was because his clan hadn't built their own Dojo. It actually belonged to a solo Tenno who had created his own clan and just let them take over as long as he got a berth. He was referred to as Old Man or First most of the time, despite looking about as old as any of them, due to acting as old as dirt. This was an amicable relationship. The Clan built on and extended the Dojo, The First dropped weapons, Mods, resources and equipment off for newly-awakened Tenno. No one had ever seen him fight, since he fought solo, but his scores on the Obstacle Course showed at least passable talent. The last time Dor'han had seen him was just after that incident with the Idiot Mad Scientist. Huh, that was a bit back. He was due in for a resource dump.
This was nice because the extra Rail the Clan had deployed had drained them of a lot of resources. That was why he and his team had just been off running Nef Anyo out of several billion credits the obnoxious fool could unfortunately well afford. He rubbed at his chest. Prodman kicked like a Moa! He'd barely been able to keep his eyes open on the Liset ride back. Now all he wanted to do was sit down, have a break and...
"Bikka, why are you in my chair?"
"It's comfier than the floor?"
He sighed as he picked her up and deposited her back in the supplicant's position on the other side of the desk. Where she knelt, bouncing in place until he couldn't take it anymore.
"And the reason you're here?" He flinched as she sucked in a huge breath.
"Simaris is grumpy you evaporated that Corrupted Moa and Clem called about bowling night and the Old Man's back and Crumples ate through the water garden's power hose again and someone beat your Happy Zephyr high score and Shuri's new Lich wants to talk with you and Taylor's Rail yes I put those capital letters in there because it belongs to Big Sis is sending out huge energy blasts and hey come back!"
Shuri stared proudly at the massive energy surges tearing into space. Even according to her clanmate's wildest calculations, they were sure that she couldn't get this much power out of this design. And that idiot Grineer dabbler called her mad! Mad! He didn't realise the true depths of her genius! She'd show him and his stupid space-fists! Just as soon as she could get up!
Dor'han ran into the lab to the sight of two Tenno literally sitting on their squadmate to keep her from reaching the Solar Rail controls. Alyssa waved to Bikka, over Shuri's annoyed yelps. "She got into Taylor's special blend. You know, the one she called Black Blood of the Earth?" Everyone winced.
Elan was by the controls, where Dor'han joined them. "We've tried powering the Rail down, but it's not responding," they muttered. "Something is very wrong. Energy readings are all over the place."
"It's been weeks of acting funny. I thought Shuri had it locked down."
"It unlocked itself, somehow!" Shuri tried to say. Unfortunately, everyone else could only hear in the normal non-time-dilated way, so all that emerged was a high-pitched screech as she tried to catapult her brother and sister off.
"It's been acting strange, even more than usual," Bikka chirped.
"Well, if we're locked out of that, we'll just have to do things another way," Dor'han replied, unsheathing his Amp. The power surge when he tried to jack in blew him across the room. "Well, let's try another another way."
This led to several tense minutes as he used his Archwing to get close to an outside power access panel and another few minutes of hacking the Dojo's power grid to reduce the power gradually. A Solar Rail wasn't something that could just be switched off. The energies that could casually traverse the Origin System and could propel a craft to another star were not to be trifled with, especially with their best scientist hopped up on enough caffeine to drown a Hyekka.
Finally, they all breathed a sigh of relief. Then Shuri wriggled free and attacked Ker'al. Crumples thought she was playing and drowned her in Kubrow slobber.
The scientist had had the indignity of being slapped several times with Vazarin healing to burn through the unholy beverage (which had eaten through her mug while no one had noticed). "I've never seen anything interact with a Rail this way. It's been like this for weeks, interference shifting almost to counter my design changes. But this? This is a new step up. This... this wasn't me." Shuri whispered, checking the readings again.
"These readings..." They all turned. The Old Man was there. He looked like he'd seen a ghost.
"You know what these are?" Ignoring Shuri, the man stormed out, heading for the Armoury. They all followed, alarmed. They'd never seen even so much as a glimpse of fear on the other Tenno's face.
"Hey, Old Man!" He was ignored as the First drew forth his gear.
"We have maybe... oh no." The First stared out of the viewscreen. Following suit, Dor'han felt his blood freeze as a Murex tore its way into realspace mere light-minutes away from the Dojo.
"At the Sentient's current speed it'll only be days before it reaches Earth," Shuri whispered. "Their arrival was what was interfering with the Rail."
"Looks like it's time again," said The First, taking up his Glaive and suiting up in his Warframe.
"What do you mean?" Bikka cried. "Tell me, Hayden!"
Excalibur Prime walked from the Armoury. "Go get your wayward sister, we need all the Tenno. We go to a New War."