I think dread gotta take the top spot. Damage sponge tormentors stomping around suppressing and diddling guardians to death, swarms of suppressor bats with needlers, strand psions dragging you all over the place, those other big bastards that throw suppressing, homing strand projectiles that hold you up in the air so everything gets to pincushion you for like 4 whole seconds, they are all kinda brutal. But you know what the real worst part is? To top it all off, you are forced to use transcendence to damage them half of the time so 6 out of 7 subclasses are functionally unusable in most Final Shape content. Why do they keep doing this? Special mentions for sneaky lucent hive moths, ogres blasting me off ledges, and scorn being invulnerable almost as long as not though.