Last Refuge

[Toaster]

This is an interesting concept for a weapon, but there's already something similar to it: The Tracer (albeit it is not good). You can also get a mark trait from crafting sometimes, so this wouldn't make it terribly unique. That being said, the trait as it currently is is hilariously overpowered; 30 seconds is much too short of a cooldown, especially because cooldowns begin as soon as activated effects are activated, not when they finish. This essentially gives you permanent wallhacks on a 10 second cooldown. With that in mind, I propose the following changes:

Last Refuge
Primordial AK-47
Accuracy 20%
Clip -5
Firerate 20%
Damage 25%
Mobility 5%
Reload Speed -15%

While you are under 10 health, you gain complete vision of all players that are currently alive. As a Traitor or Detective, your teammates will have a colored boarded around them.

The risk-reward fits much better with the theme of the weapon, while keeping its original idea intact.