Gnosis/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.

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.