School of Demonology (Corpus Malicious)

The School of Demonology explores the cosmic creatures
of chaos and evil: the demons. As you focus your studies on
demonology, you learn the nature of demons, as well as their
powers and methods. As you delve deeper into demonology,
you learn how to manipulate these creatures, bringing them to
your world temporarily and binding them to the rules of our
reality.
Mastering demonology generally leads to an evil path. It
is a taboo in most societies since the powers of demons and
their methods are evil. However, through careful practice, this
mastery can also be used in non-evil ways.

Demonology 101
Your studies regarding demons grant you an extended knowledge
about them. Starting at 2nd level, you gain the following
benefits:
• You can add your proficiency bonus again on Intelligence
(Arcana, History, and Religion) checks you make about
demons.
• You gain advantage on the rolls you make in your social
interactions with demons.
• You can summon a Quasit as a part of the find familiar
spell.
Demonic Summoning
You have been granted knowledge on demonic and forbidden
summoning rites by your fiendish sources. Starting at 2nd level,
you can use your action to summon a demon with a Challenge
rating 1 or lower (this Challenge rating increases to 3 at
6th, 5 at 10th, and 7 at 14th level). Summoned creatures stay
with you for 1 hour. Once you use this feature, you must finish
a short or long rest to use it again. You can use this feature
twice at 6th, three times at 10th, and four times at 14th level.
Also, you can choose to conjure creatures that are changed
by creatures with corruption (fiendish) template (p.250) with
conjuration spells (such as conjure elemental). You can only
affect beasts, constructs, dragons, elementals, fey, giants,
humanoids, monstrosities, and plants in this way.
Demon Ward
Starting at 6th level, you can create a ward against demons.
You can prepare a circle with a 10-foot radius by performing
a 1-minute ritual. Demons standing inside the circle cannot
leave and ones standing outside the circle cannot enter. To
attack the inside of the circle (or outside if the demon is within
the circle), the demon must succeed on a Wisdom saving
throw against your spell save DC, or it cannot do so. The
demon ward stays active for 1 hour.
Abolish Demon
You are now an expert at using magical energies to summon
demons and converting that energy for other purposes.
Starting at 10th level, you can use your reaction to abolish
and destroy a demon you have summoned in order to create
and wear an instantaneous shield that can absorb damage.
The amount of damage that this shield can absorb is
equal to 5 x the challenge rating of the demon.
Demonic Binding
Starting at 14th level, you gain the ability to perform
one of the most forbidden rites of demonic arts and
can summon and bind demons to your service for a
limited time. This feature requires serious preparation
because it calls a creature of another plane and
binds it in a way that defies the rules of reality.
To perform this rite, you need a vial of blood
taken from the body of a living humanoid within
the last 24 hours, a bowl of sulfur, and a bowl of
saffron. You draw two circles on the ground
using a mixture of these components. One is
for summoning the demon and the other
one is for binding it to your will. Then
you perform the rite. You can read the
words that must be spoken in 1 hour if
you rush through it, or in 8 hours if you
read it slowly.
In either case, the demon is summoned. It
can be a demon with a challenge rating 9 or lower.
If you cast it in 1 hour, it can make a Charisma saving throw against your spell save DC to not be bound. Otherwise,
no roll is required. This binding stays active for 66 days if you
perform the rite in 1 hour or for 13 months if you perform it in
8 hours. You can use your action to dismiss the demon at will.
You need to perform the rites again to summon and bind it
again. You can summon a type of demon or a specific demon.
Summoning a specific demon requires the name of the demon,
a piece from the demon (a piece of hair, a part of skin, etc.), or
an item strongly connected (a weapon, armor etc.) to it.
The demon obeys your commands. It can travel with you,
guard you, kill or steal for you. However, demons do not like
to be bound and used in this way. So, the demon may not want
to save your life in times of trouble if you do not command it
to do so. If you die, the demon is set free and it will surely try
to wreak vengeance on you, your soul, or whatever is left of
you.