Alter Aeon Online Help

Keywords are:  'necromancer skill summon demon shadowfiend fiend shadowfeind feind'

Skill: shadow fiend             Lvl 22 Necr  (28%)
                                (helpful)   Requires: consult demon
                                Group: Necromancer Demonlore

Usage:
summon demon [soulstone] shadow

Using the 'summon' command, a necromancer may summon a demonic shadow
fiend to assist in combat.  Shadow fiends are very resistant to normal
damage and magic, and make excellent tanks in certain situations.  The
major drawback is that they cannot be healed, and when sufficiently
injured, they simply return to their home plane.

You must offer a soulstone to a shadow fiend to make a pact with it.

Note that shadow fiends are known for interpreting the terms of their
pact very loosely, and often return to their home plane if there is too
much time wasted between battles.