Serpentis

The first level of Serpentis costs one blood point to activate. Against vampires or other supernaturals, it also requires a contested Willpower roll.

The second level is essentially the same as the book, except that it costs a blood point to activate for one scene, and the attack rolls are difficulty 7, like most attack rolls.

The third level is unchanged.

The fourth level costs two blood points to activate, but has access to the abilities of the second and third levels as well.

The fifth level has new mechanics for removing a heart. An "untrained" removal will deal five aggravated damage, and the subject will lose five blood points. The vampire performing the removal (whether on themselves or on another subject) may roll Dexterity + Medicine to mitigate this: each success on this roll subtracts one from both the damage dealt and blood lost. (So a vampire removing their own heart with three successes on this roll would take only two points of aggravated damage and lose only two points of blood.)