Additional UNDETECTABLE effects:
When Undetectable, the killer and any special visual effects they emit will be:
- Fully de-saturated (black & white).
- 10% transparent (ever so slightly see through, blending slightly with the colours of the surrounding environment).
Their footsteps will now be silent but their breathing noises still remain, so if you're REALLY paying attention, you can still narrowly avoid sneak attacks.
An Undetectable Oni would now not go thumping about with ridiculously loud footsteps (making Undetectable useless) and his bright-red flame would turn a greyish-white, being considerably less noticeable to a survivor not paying attention.
Killers using incredibly bright and colorful cosmetics would no longer be punished for wearing such things in a stealth build, as becoming Undetectable turns them black & white.
And no, this would not be too strong. Remember survivors have a third person view and can literally look over and around obstacles. This change (in-particular the footstep one) would allow so many more killers to effectively make use of Undetectable.