Pit Fiend and Pit Lord
|• Summon demons|
"Pit fiends and pit lords attack with tormenting whip blows. Once per combat, pit lords are able to resurrect dead allied troops as demons in place of another action. The number raised cannot be higher than the number of pit lords performing the resurrection" RoE manual
While Pit Fiends do not have any special abilities, Pit Lords are able to summon Demons by resurrecting allied dead creature stacks. Each Pit Lord can summon up to 50 health points worth of Demons. Because Demons have 35 hit points, this basically means that 7 Pit Lords can summon exactly 10 Demons. However, the total health of demons summoned this way cannot exceed the total health of the dead stack nor can the number of demons exceed the number of creatures in the dead stack. In other words, the dead stack must have had at least 35 hit points in order for summoning to work. A stack of one Pikeman cannot be resurrected while a stack of four will summon one demon. The full table can be seen here.
It should be noted that non-living cannot be converted to Demons. Additionally, health increasing artifacts (Ring of Life, Ring of Vitality, Vial of Lifeblood and Elixir of Life) are counted in the calculations dead creature stack's total health.
Demon herding (also called demon farming) is a tactic that can be used for Inferno. The basic idea is, that the player deliberately sacrifices Imps and Gogs in combat in order to summon them back as demons. This is based on the fact that imps and gogs have lower attack to defense ratings than demons, and therefore their hit points are more valuable. You can also herd demons from cheap low-level troops from other towns. Additionally, cloning hero's pit lords will grant an extra number of demon summonings. By using the Clone spell or having multiple Pit Lord stacks, it is possible to resurrect the same Demon stack several times during a single battle.
Note that Cursed Ground prevents Pit Lords from raising Demons.
The count of resurrected is determined by:
In order to use the full potential of resurrection, [dead_single_health] shouldn't exceed the health of demon (35). If the stack consisted from imps, optimal count of units is 12.5 times count of pit lords; if the stack contained gogs, optimal count of creatures is ~3.8 times count of pit lords (provided no health increasing artifact is in place).
Heroes with a specialty
- Nymus the Demoniac has pit fiends as a specialty, which increases the attack and defense skills of any pit fiends or lords for each level attained after 5th level and gives them a speed bonus of 1.
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Pit Fiends and Pit Lords are decent level 5 creatures, boasting good stats, but pretty low health. However, the Lords' main role is to summon demons from allied dead stacks when fighting wandering monsters, in a tactic called "Demon farming/herding". In big battles, they are used as offensive support units.