Prison of elders should have levels like so. If it's a vex level then all their best should be a round. Example. Nexus, divisive mind, and any other special named vex. (Atheon being a level 5 additive) If it's the hive. Then all the specialist of the hive as well. Level 5 can be the elite from all enemy types but only 4 And so on with the fallen. Give them boost and get a challenge.