Effects Guide
Crow
In nexus interact with second from right symbol to go to Shadow Swamp, find there a fast-walking red creature and interact with it to get effect.
Young
In nexus interact with top-middle symbol to go to Star World, find there a weird yellow like figure and interact with it to get effect.
Pistol
You need Young Effect.
In nexus interact with the first from right symbol to go in Gray Faces World, go north-west to the two pillars and walk between them (from behind), in slightly north-west direction find eye on the wall and interact with it, find some kind of entrance but before that use Young Effect to go in Place of Crime, go south two rooms and interact with the pistol in room from left to get effect.
Dark Man
In nexus interact with the first from right symbol to go in Gray Faces World, find there a little black creature with a blue eyes and interact with it to get effect.