Why slot "hard" death nova with Iron Rose LoD?

So looking at the leaderboards for LoD/Iron Rose builds, I see that everyone seems to have blood nova equipped in a skill slot. Why is that? I’m sure I’m just missing something, but I’m having trouble figuring out what the hard skill adds that the Iron Rose procs don’t.

Simulacrums will do the skill you have on the bar, and proc Area Damage on top of that.

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Ah, got it. Thank you!