Migrants are the strange phenomenon which brings people in from various universes and deposits them in the setting, or vice versa. They're a type of Schwarzschild wormhole which bridges across parallel universes. In addition, a new type of entry is available: Breaches.
On the side of the person being taken away by the migrant, there's a fine, barely visible red mist. It surrounds the target getting migrated, and envelops them, then dissipates, leaving the target vanished.
On the receiving end, there will be a blue mist, followed by an apparent warping effect of the space where the target is coming in. The people on the receiving end will be able to see the incoming migrant (but not vice versa) and their surroundings. After a moment, the target will seem to slow down to a stop due to time dilation. The blue mist and spacewarp effect will seem to fade, and the target will come back up to normal time, deposited at their destination.
Things to Know
Both migrants and breaches are seemingly completely random. There is no known force which can willingly create them on the island or mainland. This means that no matter who your character is or who they know, they cannot come into Infinitas of their own volition. There is no prep time, and no warning. (There are
exceptions, but those are taken on a case-by-case basis by the GMs.)
Migrants are one-way. If you see an incoming migrant, you can't jump through it to get to the opposite end. Likewise, you can't see where you're going to come out from the receiving end. Blue breaches however, are 2 way, but still a blind leap. And a red breach can be 2 way if there's no force being exerted on it, but it still will transform someone who passes through.
Migrants stop any relative momentum, and from the frame of the planet's surface, deposit you at a standstill. So if you have a character who is flying when they migrate, expect them to stall out upon arrival. Breaches, however, do not, and a character can keep walking or moving through one, or in the case of a yellow, even come flying out.
Migrants/Breaches don't tend to place you in situations that would immediately kill you (For example, they don't deposit you in the vacuum of space). However, they can place you in situations of somewhat immediate peril. Such as in the vicinity of an angry dragon, in ice cold water, or high up in the air (Though that is extremely rare).
Most characters, upon being migrated in and meeting another person, will be directed to a welcome center
for orientation on the place they've found themselves in.