[The more I talk about my ideas on Discord, the more tempted I am to let it all loose and reboot Evren has the 100% more Sarkic, 100%-more inhuman and feral, 100% more Lovecraftian than she was. Unleash my dreams. Go stupid, go crazy.
I was talking about making the Weigher of Souls into something like an Eva or a Frame from Warframe - a semi-organic machine with flesh under the panelling, between all the wires and engine bits. When it gets damaged in battles and the armour comes off, it's basically a Tyranid ship with loads of eyes and mouths; fixing it involves taking panelling off and doing surgery on the flesh inside, which is also their life support and sewage treatment system. It's a psyker and sapient, so they communicate with it telepathically, giving it the ability to navigate the Warp by itself (and send messages as an Astropath Choir would). They get the biomass to clone new bodies for the Jackals from specially-grown parts.
Evren's body would be more of a disguise crafted to look like her old self. Her age and power, her dabbling in Sarkicism, has slowly warped her into something less human, something more like Ion or the Emperor. Her real body has to be hidden lest she terrify everyone and get driven out of the Imperium, even by her own nephews and brothers. The Emperor knows what she looks like, of course, but since she puts a human face on, he's willing to let it slide. For now.
She shapeshifts effortlessly, taking on dozens of different guises, and infiltrates the other Legions - and, later, Imperial Guard regiments and even Traitor Legions - as His eyes and ears on the ground. Most of the time she poses as a high-ranking Imperial noble, a diplomat, or a remembrancer. She has dozens of different masks to wear. Her true name isn't well-known outside of the Primarchs, to the point where many Astartes haven't heard of her. Some even believe that the IInd Legion had been purged and ceased to exist, alongside their Primarch. Which suits the Tomb Jackals just fine.
I'd make her less childish and more serious - and try damned harder to play her that way, as I've said so many times before lol - but playing the part of a light-hearted, immature person much like the Doctor does. Both as a way to relieve stress and to get people to underestimate her, and because 28,000 years of life has driven her more than slightly bonkers. But, like Curze, she's a mostly useful kind of bonkers and completely loyal to humanity/the Great Crusade, so the Emperor endures that, too. He gives her a few tools and toys she needs for her mission and sends her off with 13,000 Astartes he was planning to be rid of. As long as she does as she's told, he can excuse most of her... strangeness. And she always does as she's told.
Blah blah blah most of the other stuff would mostly be unchanged, except for trimming down the NPC list and neatening up the mess the Legion hierarchy has become. Add more science even as I add more horror. Make them more Foundation. Blah.]
