Shadow classes use dark powers drawn from Khyber. Mechanically they care about dead and bloodied creatures.
Level 4 Feats
Dead Drop
Benefits: Whenever you roll an 18-20 on an attack against an enemy that has not yet acted in combat, that attack critically hits.
Death's Veil
Benefits: You gain the Death's Veil power
Death's Veil
Dark energy conceals your shape
Level 4 Invocation
Shadow
Action: Minor
Special: You must be afflicted to use this power.
Range: Personal
Effect: You expend a healing surge (and do not heal). Enemies attacking you have disadvantage until the end of the next round.
Feeding Frenzy
Benefits: Whenever you bloody an enemy or reduce one to 0 hit points or fewer you gain edge on attack rolls until the end of the next round.
Ghoulish Rejuvenation
Benefits: Whenever you bloody an enemy or reduce one to 0 hit points or fewer you may expend a healing surge as a free action to regain hit points equal to your healing surge value.
Grievous Wounds
Benefits: Whenever you hit an enemy that enemy cannot regain hit points or gain temporary hit points until the end of the next round.
Peer Into the Void
Benefits: You gain improved darkvision out to 120', giving you full color vision for the full distance. When you first encounter a magical darkness effect you make an Arcana check. If you beat the Arcana check made for the magical darkness it doesn't obstruct your vision.
Shadow Restoration
Benefits: Whenever you expend a healing surge for any reason you may make a saving throw against one effect currently afflicting you that a save can end.
System Shock
Benefits: Whenever you apply a (save ends) effect to an enemy that has not yet acted in combat, that enemy has disadvantage on saving throws against that effect.
Unnatural Energy
Benefits: You gain the Unnatural Energy power
Unnatural Energy
You draw energy from an opponent's soul to move on to your next target
Level 4 Invocation
Shadow
Action: Free Reaction (Trigger: You bloody an enemy or reduce them to 0 or fewer hit points)
Special: You must be afflicted to use this power. You can only use this power once per round.
Range: Personal
Effect: You expend a healing surge (without healing) to immediately take a bonus standard action
Walk the Shadowed Path
Benefits: While you are in dim light or darkness your speed increases by 10'.
Word count: 0