Skeleton and Skeleton Warrior
"While skeletons and skeleton warriors are average foot soldiers individually, it is possible to build massively populated troops of them. They are numerously produced, are the main creature produced by the Necromancy secondary skill, and other creature types can be converted into them at Necropolis Skeleton Transformers." RoE manual
Building the Unearthed Graves increases skeletons' growth by 6 per week.
If all slots are occupied and you only have Skeleton Warriors in your army, then Necromancy will raise only 2/3 of the numbers of regular skeletons as Skeleton Warriors.
Generally, it is better to generate regular skeletons and to upgrade them later, since almost 50% more skeletons (2 skeleton warriors -> 3 regular skeletons) is worth more than the cost/convernience differential. A small downside of this is that regular skeletons slow your army due to lesser movement.
Heroes with a specialty
- Galthran the Death Knight has skeletons as a specialty, which increases the Attack and Defense skills of any Skeletons or Skeleton Warriors for each level attained after 1st level and gives them a speed bonus of 1.
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With the necromancy secondary skill it is possible to "harvest" skeletons by attacking wandering creature stacks. If the hero has skeleton warriors and no empty slots, the necromancy will produce skeleton warriors to the hero's army, instead of normal skeletons, but only at 2/3rds the rate. Normally, it is more convenient to have regular skeletons and then upgrade them.