So, after chatting with a friend I have several thoughts to share:
1) Oona falling to Chaos would have been terrible, horrible absolutely bad time for everyone around, because she would be an absolute creacher, running around creating nightmarish forests with horrific monsters
2) It would also be very sexy of her, so I will make a possible design. First rough draft to be seen above.
Still thinking about chaos!Oona. Trying to figure some more details about the details of her appearance in this alternate version.
I promise this is the last one. But basically some key points about this alternate version of good old Oona.
- After a failed attempt to get to Terra to ask some really tough questions from E, she got stuck in the Warp and only got out after getting into a suspicious bargain.
- Not with a specific god, but with Chaos Undivided more likely. So now she has four sources of chores instead of one (Emps).
- Emerges as daemon with mutated monstrous marines and chaos kaiju. Hangs around for the Siege, does some creepy evil druid stuff. Legends have it Custodes are still cleaning up the nightmarish forest she grew on Terra.
- In a big denial about most things related to her current state and fall. Calls the leader of her cult Madb, because it is still hurts that Madb, her First Captain and low-key best friend told her to go to hell.
- Switched from being a very efficient sniper to turning into various monstrous forms to tear people to shreds.
- What is she doing after Heresy? Probably sits in the Eye and grows monstrous beasts on some daemon world she tries to shape into her homeworld.
- It is good to a be a snack, but it would be bad to be called one by her.
- Probably has some new moniker like Queen of Monsters or something.