Technically, you can play story missions on several different difficulties up to 30. But I think the only modifier is heroic.
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You can but you aren't allowed to personalize them with other modifiers (arc burn, juggler) my hope is they let the players make their own modifier combos to give players a bit of personalization for a mission to make it as hard or as easy as they want it to be.
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I wish vanguard strikes had more modifiers.
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So true. Definitely would make them a pretty fun challenge adding burns and all those things to make it go from easy to crazy hard.