Expert's Corner (by ThE_HyDrA)

Necropolis' abundance of special buildings help to strengthen their relatively weak creature statistics. The Necromancy Amplifier is another bonus that aids the Necromancy skill, which can result in a throng of skeletons within the first few weeks. Its expensive sulfur cost does not endear people to it, though thankfully, sulfur is only required with the Lich's Mausoleums and Unearthed Graves, making a total cost of 25 (aside from Mage Guilds), which is easily affordable.

The Shrine of the Netherworld works in a similar way to the undead transformer, except that the creatures are transformed in their level, making it extremely efficient. This may be necessary for spells like death scream and the Lich's area attack not affected your living creatures. You can of course be selective and choose creatures that you feel will benefit you as an undead. It is also good for sieges, so, if you're bracing yourself for one, and you don't yet have this building, it may just help to swing the tide in your favour.

The Unearthed Graves are another welcome bonus to the Skeletons' already burgeoning population thanks in part to Necromancy. Chilling Steel and Toughness work well with your skeleton archer legion, so this building will only serve to strengthen that power. The Dragon Graveyard is a much needed structure, enabling your level 7s to compete with other like-leveled creatures from the other towns. It is no secret that Spectral Dragons are drastically weaker than their Black or Emerald cousins, but this structure can help to equalise that defecit. The price is not much, and the pre-requisite is nothing when compared to the town level you need simply to recruit Bone Dragons.