Do you mean Nighthound keeping his memories from this RP and taking them into Oregon, or vice versa?
When Karma uses his powers on an Epic, the scale of the damage often depends on how much of a difference there was between the original human and the Epic. The more the individual has changed, the more he splinters them psychologically.
For instance, there is enough dissidence between Alexandra Hawkins and Möbius to splinter her psyche completely, forming a new meta-personality that exists as something between the two. (Again, you will see.)
For anomalies, I'm thinking areas with higher or lower gravity than normal, zero-gravity regions, and complex regions held together by a series of portals. Temporal anomalies would largely be relativistic, creating areas where time flows more quickly or more slowly relative to the rest of the city.
That said, the building full of roman legionnaires is an incredibly awesome idea.