My fluff vision for those interested (spoiler tag seems not working, so I used quote)
Since quite nothing is told about their origins, I defined a symbiotic relationship between crystal and organic, like oysters, but in humanoid form: organic provide the movement, minerals provide the shape. They came from a system where the moon hosting primordial life was torn apart into an asteroid belt around a Jupiter-like planet some time after life has evolved.
Life has continued, but with the need to grow mineral shells to protect them when "travelling" from one rock to another to gather materials. Organic cells regenerate in time so any individual is virtually immortal (but they reproduce very slowly due to their poor material surroundings in free organic material).
The crystals also helps them to provide energy to their organic cells thanks to the radiations converted by specific kind of crystals.
Crystals allow too to stock energy to be converted into weapon or propulsion (the "ionic" name because electrical charges are dispatched through ionic crystals).
Like most of advanced species in the 40K universe, they then found that the humanoid shape is the best one for interacting with their surroundings. But only a part of its species is humanoid: the young adults. "children" are the individual compound of each drones. Once many "children" have enough symbiotic relationships to be autonomous, they become humanoid, growing slower. Then, if a humanoid demiurg live long enough and start to be tired of the humanoid form, its is fed with enough matter to start shaping the minerals into mindless structures (any size from crates to spaceships) and his organic material is split in small parts to restart as an almost non sentient "children" drone.
(So I have the demiurg keywords : miner + spacefaring + resilient + ionic + long-life/wise)
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