You can purchase the Lake Witch in the Privateer Press Store.
Faction and Type
Ancient Ones Grunt Unit
Black Spot: When an allied Faction unit within five spaces of this model makes an attack by itself, it can gain +2 Boost Dice on that attack. If it does, destroy the unit immediately after the attack is resolved.
Dark Ritual: Once per turn, when another allied Faction unit is destroyed, you can spend one Power Die to place that unit adjacent to this model instead of placing it in your unit reserves.
Flight: This model can end its movement on impassable terrain and is immune to hazards except when colliding with them.