Dagger of Undeath:

The wielder of the Dagger of Undeath increases their ruler unit's melee damage by 1. Additionally, if the wielder of this artifact were to destroy a unit in a battlefield, they may choose to spend 1 nation / character magic point in order to summon a friendly Undead Army unit in the same hex, lasting until the end of the battle. The unit that wields this artifact automatically counts as melee (or cavalry if possible and desired), and has their range set to 1.