Undead
Undead as a term refers to beings that have deceased and yet behaves as if alive. All undead are considered to be non-living, and one might say that the undead are a branch of non-living beigns. Undead define a creature type, which share a similar set of characteristics. All undead are unaffected by Morale, and they are immune to all Mind Spells as well as Curse, Bless, Resurrection and Death Ripple spells. Undead units can be resurrected by the Animate Dead spell. All morale-affected units suffer -1 Morale when fighting together with undead.
All the creatures of Necropolis town are undead. Additionally, Mummy is also an undead creature.
Special abilities of creatures that undead are immune:
Zombies' Disease
Vampire Lords' Life drain
Liches' Death cloud
Power Liches' Death cloud
Ghost Dragons' Aging
Mighty Gorgons' Death stare
Wyvern Monarchs' Poison
Pit Lords' Summon demons
Azure Dragons' Fear
Undead creatures:
Skeleton
Skeleton Warrior
Walking Dead
Zombie
Wight
Wraith
Vampire
Vampire Lord
Lich
Power Lich
Black Knight
Dread Knight
Bone Dragon
Ghost Dragon
Mummy