This mission (and to a slightly lesser extent) The Pit are considered to be excessively long by some of the community, to the point that people will quit or suicide at the beginning the same way they used to for Skittergate before the loot dice buffs. I think the reward for Blightreaper should be increased and certain parts trimmed.
1. Speed up the timed events on Blight Reaper
This mostly applies to the gates in the sewers, but also the search for the key and the finale itself. You don’t have to make the event any easier in terms of enemy spawns, just have the gates open faster so players can progress forward and fight a running battle instead of several static last stands. You can still put your backs into a corner until each wave is over, but a skilled party can make good time by advancing and fighting at the same time.
For the gate key search just tell the players where the key is, similar to Against the Grain. This level is long enough already and the last thing it needs is a scavenger hunt.
For the finale reduce the time between switch activations such that the next switch will appear while you are still fighting the previous horde. This way your ability to fight through the horde to the next switch will improve your overall run time if you are good enough to handle the faster spawns. For those who aren’t as confident you can still finish the current horde before activating the next switch.
Also you could speed up the final gate opening animation for the sanctum once the switches are done.
2. Change the finale to increase rewards/difficulty
For the finale of Blightreaper put a loot dice inside the sanctum that players can collect.
When the players take the sword and have their health converted, spawn a boss behind them. The boss takes a while to arrive and it’s intended that the players fight their way through the horde and escape. However if you’re feeling up to it you can clear out the final horde and then fight this boss with your whole party on temp health which nets you another loot dice. To make this more fair the sanctum would always have some healing in it to give the players a second wind.
Also for The Pit you could add two loot dice to Okri’s stash to give people a reason to open it during a normal run.