What was that giant sphere that summoned the risens?

[IceBrand]

Also where do the risens come from? The future? If so, does that mean Grima has constant time warps around the world? And why did Lucina appear out of it too?

[Shamison]

If your referring to the cut scene near the beginning where "marth" saves Lissa then I think it is the time portal Lucina came from but she was being chased by the risen and they followed her through the portal. At least that's how I see it.

[Cowboy Karimov]

Don't mind it, it's just God making a handwave that will never be talked about again.

[TheFreshestSlice]

Yes, that orb is Naga's time portal back to the past. Most of the Risen in the current timeline came from the original one, yes. Also, keep in mind that not only did other portals open in different places, but some even opened up in different times, as evidenced by Laurent's C-Support with his father. This means that Risen could be appearing in Ylisse, Plagia, and Valm for much of the foreseeable future. Risen can also be created with dark magic, so there's that too, but as I said, most came from the future.

[Roivann]

According to some of the supports (Inigo says something about this, I think), the dead can come back as Risen? Or am I misremembering?

[RightfulGod]

According to some of the supports (Inigo says something about this, I think), the dead can come back as Risen? Or am I misremembering?

I dunno about Inigo's support, but it's hinted at in the Infinite Regalia DLC where the children's (and Tiki's) battle quote implies that the generals are their dead parents from the future. For example, the kids mention that the generals cry upon battle and Minerva recognizes one of them. Pretty sad lol.

[TheFreshestSlice]

I'm pretty sure all the Risen are corpses. That's why they're called the Risen.....

Anyway, they arise because of Grima's power, from what I understand. The dead don't just come back on their own, I think.

[Knight]

Magic, of some sort.