User see and access the "other side"

Pros:
-user is not affected by residents of the other side
-user can block entrances to their world
-user can escape to another world
-user can see opposites/dark versions of others
-user can borrow abilities of the other work
-user can influence the other world

Cons:
-user will most likely crave approval of the other world
-user will join those in the other world with overuse
-user is stuck in a marked of area when there
-user will only see the other version after seeing that version for long periods
-user is stuck with if ability owner makes a pact with user to get something in return for use
-user is easily over thrown

Weakness: our world
User can't touch people from our world and will always prefer the other side