Trying to make/finalize two custom Space marines legions

Okay, I am completely inexperienced with this kinda stuff, so I’ll just dive in(ignore the image, I’m also planning out a heavy-metal and punk themed Emperor’s Children army, but that isn’t really a custom “chapter”)

I have been trying to cook up two separate Space Marine legions, I have all of their stuff detailed out, but every time I try to finish them uo fully, they feel incomplete and I don’t know why!

I’ll give a brief summary of the two(sorry if they’re awful, idk wtf I’m doing lmao, I thought of these initially at work)

1: The Illumined/The Illuminators

   A Chaos Space Marine cult, who worship Slaanesh as a “pure god” whose image has been corrupted by the three chaos gods, and the Emperor’s children(their founding chapter). Their whole “gimmick” is basically preaching how Slaanesh is the Goddess of Joy, fulfillment, and Passion, whose love and acceptance for mortals is truly divine, and their “journey” to enlightenment Via the Obliterator Virus. Basically an entire Cult who treat the Obliterator virus as a path of ascension, a way to become one with their Goddess of love. They think Slaanesh is genuinely good, with the forces of chaos, Especially the Emperers children and the Imperium “Slandering” her image. If I haven’t stated it enough already, they REALLY hate the Emperor’s Children. They treat every act of violence they do as completely justified by their God, killing any and all who cannot or will not learn to believe in the Goddess of Love, they honestly believe themselves as pure as any could be, despite half their army being completely mutated from the Obliterator Virus. 

Their symbol is a pair of Prayer hands encircled by a Halo, and their armor is primarily White with noble gold trimming. 

2: the Bastions/the Adamant Bastions 

   Kinda went a similar approach to the Illumined in terms of the chapters “gimmick”.

They’re a Ultramarines-based Chapter, who all Believe that perfecting the use of Centurion Armor is the closest any Astartes can get to becoming something akin to a Primarch(they are delusional basically). An Entire chapter based on perfecting and developing Centurion Armor. They believe that becoming a Centurion makes them kinda like Semi-Primarchs. Not literally, but it fuels their egos to think so. An Entire legion of Centurion suits.

Centurion captain 

Centurion Apothecary.

Centurion Librarian.

Centurion  lieutenant 

Centurions across the board. 

Their “trainees” or “soon-to-become” Centurions are Aggressors, the step before a Centurion(they’re closer in stature and overall shape compared to a terminator so I picked them, literally the only NOT-Centurion, models in the army).

They fully and truly delude themselves into thinking they are individually closer to Guilliman than to their standard Space Marine brothers. 

They’re like… opposite Salamanders. Take the average marine putting themselves ahead of “regular” humans, but flip that around to Bastion Centurions putting themselves above standard marines.

Their symbol is a Mountain with the Imperium symbol within, and their paint scheme is a dark metallic silver with Golden shoulder pads and trimming(trying to go for a silver-ish Custodian kinda look….. but for fifty Centurions). 

I tried to make both Legions unique and distinct, both having a gimmick nobody else does(ascension via Obliterators, and Just “Five. hundred. Centurions.”)

Man idk wtf I’m doing. 

I’m trying to finalize two Custom Chapters, idk what to do