This skill helps various rift spells in various ways. Probably.

It’s suspected one shouldn’t go crazy cranking this skill to super high levels.

If you want more detailed information, use the command “tell moss I have some bribe money for you.” and follow the instructions you’re given.

The in game help reads:

Skill duration: random.
Type of skill : automatic skill (arcane skill).
Affecting stats: None.
It uses no endurance points.
Knowing entity life forms is an integral part of the guild of riftwalkers.
This skill, although difficult to learn, will have very beneficial effects on
a number of guild spells.