To put it bluntly, SIVA was an easy boss. Yet SIVA completely wrecked the Iron Lords. Here's the thing. The Iron Lords were supposed to be the most powerful among us Guardians. Yet SIVA only killed about five Iron Lords. All of the others were killed by Rasputin. If more Iron Lords had been present, they would have destroyed SIVA.
So SIVA killed the most powerful Guardians. Yet after she did this (yes, I'm assuming SIVA's gender), she shut off. She became dormant. And while she was dormant, Guardians with power that dwarfs the Iron Lords rose. SIVA killed the most powerful Guardians then stopped getting stronger.
[i]Your Guardian[/i] is one of the Guardians who has power beyond the Iron Lord's wildest dreams. That's why SIVA is such an easy boss.
I rest my case.
Ooh trending.
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I don't remember ever actually fighting SIVA as a boss. Maybe SIVA infected fallen....