ACT I features a Space Marine class. In particular:

- MKVII Power Armour
- Gene-Seed Organs (Secondary Heart, Biscopea, Larraman's Organ, Sus-An Membrane, Ossmodula, Occulobe)
- Space Marine Equipment Set (Bolter, Bolt Carbine, Chainsword, Melta-Cutter)

ACT I U1 features:

- Fix for unselectable chainsword
- Fix for framerate drops overtime

ACT II features a Magos Explorator class along with several core systems and miscellaneous fixes. In particular:

- Sicarian Battle Armour
- Augmentations (Omnissiah's Blessing, Breath of Mars, Eternal Vigilance, Refractor Field, Mechadendrites, Servoskull)
- Magos Explorator Equipment Set (Volkite Caliver, Darkfire Rifle, Sollex-Aegis Energy Blade, Mitralock)
- Completely rewritten Chainsword and Melta-Cutter
- Functional visor for MKVII Power Armour
- Unlockable class system
- Custom loadout system
- Updated #bestgameplayever
- Considerable amount of behind the scenes fixes and preparations
- One (1) secret: [SOLVED]

https://i.imgur.com/lkm4aXV.png hehehehe amazing, im hyped. Cropped most of the secret for others to find if this is actually it but yeah.

I would name it Eclipse - but if you could add some 40k flare to that, that would be better

Alright then, so, is "Eclipsae" ok or I'm gonna put the initial suggestion instead?

im down for Eclipsae

ACT II U1 features:
- Fix for crashing mod settings.
- Fix for inability to throw while mechadendrites were active.
- New secret item to allow guaranteed death for the Space Marine class.
- Servoskull has a name now.
- Several other minor improvements.

very good, fixed the crashes

Nice.

ACT II U2 features:
- Libro Manualis added (find it in the Noita40K mod folder).
- New setting to prevent accidental extermination.
- Other small fixes.

ACT III U1 features:
- Subclass System.
- Extension System.
- Quest System.
- Hopefully final version of Mag System.
- Notification System.
- Integrated Codex.
- 8 new Space Marine subclasses with unique perks and/or equipment and a reworked Ultramarine.
- The First of the Velho Pattern.
- Insane amount of bugfixes and QoL changes.

ACT III U2-3 features:
- A bunch of bugfixes of critical issues nobody noticed.
- Even more polish and qol patches.
- Tutorial improvements.

ACT III U4 features:
- Hopefully final attempt of fixing the missing servoskull bug (special thanks to anonch for extensive testing).
- Reworked chainsword to better suit all kinds of corpse business.
- AP rounds now have AP capabilities.
- Yet another pile of behind the scenes reworks, patches and improvements.