a portal malfuction and starts to slowly merge the two worlds into a single one, the process extends outward of the portal 1m/s,it merge by overlaying the two world and if something like a house is in the same location they are moved to fit, while the process is chaotic and messy all architectures are left intect as they were before and no house are fused with another, the way the zone during fussion would look is that of an incredicly thick fog that progress

-choose the worlds being fused