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Keywords are:  'necromancer skill summon demon familiars'

Skill: demon familiar           Lvl 13 Necr  (28%)
                                (important)   Requires: demon lore
                                Group: Necromancer Demonlore

Familiars are minor demons that will serve you in exchange for soulstones.
They bring with them minor spells that they cast on their master and
his followers, and are useful in groups for this reason.

To summon a familiar, make sure you have a red or better soulstone in
your inventory, then type:

summon demon familiar [demon type]

However, because they are very low level, they are fragile and are ill
suited for combat.  If injured, they will return to their home plane
and consider their contract completed.

Advantages given by various demons:

A black, horned demon     - hitpoints, damage resistance
A winged red imp          - move regen, attacks, mana
An azure blue demon       - elemental saves, elemental absorb
An ebony scaled demon     - hp regen, and saving spell, breath, poison
An energetic green demon  - mana regeneration and movement