Zealot's Falx

Simple Weapon, Rare, Requires Attunement

1d10 slashing, two handed

The cultist stands over the unconscious guardsman, and splits the poor man's head from his shoulders with a single blow.  The blood runs up the curved obsidian blade, as if it were drinking it - as if it thirsted for it.  She smiles as she feels the bones in her face warp and shift.  The man's death was unfortunate, but necessary. She felt a twinge of guilt as she began stripping the guard's uniform from his corpse.  She wished the magic of the falx would grant not just her victim's visage, but their clothing as well.

The blade of this falx is constructed of unusually hard, tough obsidian.  When you kills a significant (CR 1/2 character level or greater) humanoid creature of your size category with this weapon, you gain temporary hit points equal to the value you would receive when expending one hit die.  

So long as you possess temporary hit points from this effect, you bear the visage and appearance of your victim as if you were under the effects of the alter self spell.  You remain under this effect until the temporary hit points you gained from their death are depleted or expire.

Temporary hit points gained from this weapon expire after you take a long rest.  Temporary hit points from this weapon do not stack: the new effects of the weapon always displace any existing effects.

This weapon can be used as an arcane focus for necromancy and divination spells.