With atheon, we were teleported to another place and forced to fight our way back out.
With Crota, we were placed in an area of effect with no health regeneration.
For whatever Fallen leader, I'm going to say our status is shield corrosion. Constantly being drained of our shields, but not health.
What's your guess?
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Too simplistic and similar to hive. I think the relic could be invisibility and the "effect" (which I believe is a false assumption because the only effect in Atheon was times vengeance as the portals were more similar to the sword) would be that the boss actually tries to attack us.