Skeleton archers and Wengari Axe Throwers:
#1) The projectiles are invisible in dark atmospheres (Red background in-particular. I absolutely love the new lighting and atmospheres btw).
#2) They aggro from off-screen when moving any direction that isn’t north.
#3) When their movement speed is quickened via monolith buff or blue/yellow elite pack mod, so is the speed of the projectile. Often times this makes them impossible to side-step dodge. If they aggro from off-screen there is no chance of reacting in time.
#4) Their damage does not match the other enemies in the echo, the only way to survive an encounter when they’re quickened is to be moving north (where the draw distance is much larger and therefore do not aggro me from off-screen) or to farm too-low level monoliths.
#5) They often spawn in ridiculous numbers and will pepper their attacks to where you cannot feasibly attack back without taking a hit and getting stun locked to death.
Typical things that one-shot me are giant mobs with heavy attacks, or televised aoe attacks. Then enter Skeleton archers and Wengari Axe Throwers and it just takes 2 of either to match that kind of damage. They just out-scale the corruption level that is being farmed and become too lethal.