Endless mode is a mode exclusive to killing floor 2 that was added as part of the infinite onslaught update.
Killing floor 2 endless mode record.
Every fifth wave will feature a random boss after which the match difficulty will slightly increase.
It is a variation of survival mode that allows players to participate in a nearly endless amount of waves.
Of course in killing floor you respawn every wave but if the wave difficulty goes up each time the likelihood of a team wipe goes up too so isn t it reasonable.
Episode 192 killing floor 2 ps4 gameplay endless mode and new weapons duration.
From killing floor 2 wiki.
Even on normal difficulty you may see enemies use abilities and formations.
There wouldn t be a point in recording stats in endless per perk because you can change perks every wave gotchyah.