Bloodtheif

This unique variant of rogue plays off of the same concept as Mat Mercer’s “blood hunter” class. You can put two and two together 

Critical blow

As the player lands a sneak attack, the blood coming from the wound first splashes from the point of impact, than twist back and solidifies into a scarlet spike that deals half sneak attack piercing damage (per hit dice used)

Chain drain

The player invokes the chain drain ability. All enemies that have been wounded must make a successful Con saving throw (DC= 8+Pro+Con modifier) or take 1d6 necrotic damage, and heal the closest friendly unit by this damage.

Ravenous sight

The rogue can now see anything with blood within 30ft regardless of cover or invisibility.

Bloodstealer

As the attack plunges into the enemy, the blood flows from them to the cunning rogue who delivered the blow. This heals the player for a number equal to there sneak attacks damage.

Red Fountain Runs Dry

After a successful attack, the player may inflict Red Fountain Curse on the target. The target creature must make a Con check (DC= 10+pro+Con modifier) or take an additional 1d6 of Bleed damage. This damage occurs every round until the wound is healed, or the creature dies. The creature takes an additional amount of damage = to Con modifier for each square (5ft) they move.