New type of enemies

[BlackSniper]

I like both idea's, but I think it will be very frustrating when a hero Nord can spawn behind you like Tricksters and kill you before you can even respond (when having a ranged weapon in your hands, and since they might be able to 1 hit you with the boosted hero stats). Maybe a chat warning as you mentioned or a sound warning indicating they will spawn would be a nice balance to it.

Bodyguards are interesting, but I think they will still be able to be killed pretty quickly / early if people just focus on it while the boss is at a distance. You could also consider 'reïnforcement' troops that will spawn when the boss is half health or the last survivor. Maybe even have them spawn on the boss itself like Tricksters.