A unit of Sisters of the Thorn knows a single spell (chosen by their controlling player before armies are deployed) from either the Battle Magic or Elementalism Lore of Magic. The unit may cast this spell as a Bound spell:

• If the unit includes a Handmaiden of the Thorn, it may cast this Bound spell with a Power Level of 1.

• If it includes both a Handmaiden of the Thorn and a standard bearer, it may cast this Bound spell with a Power Level of 2.

• Otherwise, the unit may cast this Bound spell with a Power Level of 0.