Stronghold: Undead (2nd edition)
Game description from the publisher:
Dark forces are brewing and the Necromancer is at the gates...
Stronghold: Undead is a re-balancing of the original Stronghold: Undead expansion for the second edition of Stronghold. This expansion introduces rules for gathering mana, spell casting, and terror. Along with new buildings and abilities for the Defender, Stronghold: Undead includes a brand new map with new routes for the Attacker to breach the walls.