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.
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You make no sense.