Pillar of Bones

• Adds 10% to Necromancy skill of all Necromancers under player's control (cumulative by all cities); i.e. supports Necromancy special ability.
  

Cost: 1000g 10s

Shrine of the Netherworld

• Provides -2 morale penalty for attacking enemy, allows transformation to undead troops (according to creature tier, if corresponding dwelling is built in this city).
  

Cost: 1000g 5o

Unearthed Graves

• Boosts skeleton/skeleton archers growth by +6 per week.
  

Cost: 500g 5s

Dragon Tombstone

• Boosts Bone Dragon/Spectral Dragon growth by +1 per week.
  

Cost: 3000g 10o 10m

Tomb of the Lost

• Provides extra gold income, extra creature growth and boost necromancy skill of all player's heroes. Need Tear of Asha to build this structure.
  

Cost: 0