The goood old Heralds
they don’t replace packs, they’re their own spawn
game just rolls for it when you kill stuff, doesn’t care if all boss packs are already up or not. you’re not “blocking” heralds by spawning everything first
you can clear the whole map, leave packs alive, come back later and still get heralds. it’s tied to kills, not available spawn slots
den example works the same, corpsefire being there doesn’t matter
people overthink this because of old spawn logic, but heralds don’t follow that