@Tomipapa , slight correction, the icon you posted was for the Celestian Secret Tech. The named technologies you're referencing are for a Secret Tech with a currently unknown name, ending in "sis".
Personally, if you wanted to link them, I would consider this bracketing of key identifiers: (again,
personally)
Promethean: primarily Mechanical(two/three of the three/four units), Thermal, AoE damage, and to a lesser extent, raw defenses(anti-Thermal in particular)
-- Thematic links:
Primary:
- Vanguard: primarily Mechanical, Thermal(Laser Weapon Tech), durability from raw defense stats(health/armor)
- Dvar: primarily Mechanical(implied), AoE damage, durability from raw defense stats(health/armor)
Secondary:
- Assembly: primarily Cyborg(similar to Mechanical), unknown damage application propensity, durability possibly from raw defense stats(armor/shields)
Tertiary:
- the remaining three have poor thematic connection, and possibly poor unit mod synergy, aside from the Purifier, if their non-weapon-tech mods are primarily/exclusively Bio and Bio/Cyborg.
We can't really do an accurate detailed analysis, such that the above even counted as one, of the remaining ones, but:
Xenoplague: Biochemical, Biological
-- Thematic links:
- Kir'Ko: Biochemical, Biological, Evolution(arguably)
- Amazon: Biochemical, Biological, Genetic manipulation(also arguably)
Secondary:
- Syndicate: Biological, and possibly matching some unknown identifier for Xenoplague
- Assembly: Cyborg(it's notable that many Biological unit mods also have the tag for Cyborg, and the reverse might be true as well, or perhaps some Cyborg mods directly from Assembly are Biological, and some are Mechanical in concept), and again possibly matching currently unknown identifiers
Tertiary:
- Vanguard and Dvar have limited thematic synergy, and possibly limited unit mod synergy in some cases, although it didn't seem that Vanguard had a lot of Mech-only mods.
Psynumbra: The only thing we really know is Psionics are extremely likely, giving them a conceptual link with both Kir'Ko and Syndicate. Their units might count as Biological.
VoidTech: We only know of some unit mod names, and a weapon that deals Kinetic damage. Conceptually, I consider both Vanguard and Assembly reasonably evenly for thematic link, but that's just a personal thought on what VoidTech might be, and is entirely unfounded.
Celestian: Entirely unknown aside from the symbol. No real conclusions to be drawn.
Name ending in "sis": Military techs appear to be associated with information regulation, with a modest technological bent. The two closest factions, for different thematic reasons, would appear to be Assembly and Syndicate.