Shadow Step α

★ Prereq: requires Aysle ; At least two adds in stealth

The character’s stealth tests become Favored. If attacking a Flat-Footed foe, the backstabber may declare he’s using Shadow Step to cause an additional +2 damage.

Darkness

Darkness grants gifts of its own. Darkness Perks are related to the Law of Eternal Corruption of Orrorsh, and draw extra power from it. Due to that connection, the taint of Darkness draws heroes inexorably towards an evil fate. A hero may have up to three Darkness Perks before succumbing to the lure of temptation. If a fourth is ever acquired the character crosses one moral line too many and becomes a Stormer controlled by the GM.

It’s possible—usually in special adventures—to acquire a Darkness Perk without spending XPs. Such cases require the player to make a dark choice in return for gaining power. The Perk does still count against the total number of Perks for purchasing new ones.

Once a character has any Darkness Perks he may not take Light Perks. If he had Light Perks and is forced to take a Darkness Perk, the Light Perks are permanently eliminated.

This perk leads to Shadow Assassin.
From Core Rules