Delirium has a Massive Balancing Issue
Out of all of the different league mechanic delirium sticks out as being far and away the most difficult. This leads to big problems with the questline. By the time you are able to clear tier 15 maps with delirium the delirium boss will be a one-shot. Delirium white mobs in tier 15s are about as tanky as powerful bosses in non-delirium maps. They also do significantly more damage than anything else. This balancing seems way off. I imagine it has to do with toughness scaling incorrectly or too strongly.