The Cancer Mage

The Cancer Mage (Pestilence Arcane Tradition)
Class: Wizard

Pestilence Savant
Beginning when you select this arcane tradition at 2nd level, the gold and time you must spend to copy spells from the Cancer Mage spell list into your spell book is halved.

Plagued Nature
Starting at 2nd level, you are immune to all diseases, and become a carrier of them. No disease ever leaves you, and your face and skin are covered in boils, lesions, and pus-filled sores. Your every breathe carries innumerable plagues and ills, and when someone attempts to remove the diseases from you, either through magic or medicine, they are harmed, taking 1d4 poison damage for every wizard level you have.

Cancerous Companion
Starting at 6th level, you grow an intelligent teratoma somewhere on your body. It can painlessly tear itself from your body and walk around, being unable to attack, but being able to communicate telepathically with its cancer mage. If you are using another spell that functions like this, such as Beast Sense, this functions in conjuction with that.

Infected Wounds
Starting at 10th level, your attacks infect others with the plague and pestilence you carry. This affects both physical and spell attacks. Your attacks infect the target with 1 random disease that you are carrying.

Disease Form
Starting at 17th level, you can take the form of an illness. You will not be able to be detected in any way, except by those with exceptional scent. When infecting someone, they must make a constitution saving throw, and if they fail you take complete control over their actions. You can remain in this disease form for as long as you wish, but you will be affected by medicine and magical healing done on the host individual. When in plague form, you do not need to eat, sleep, breathe, and do not age.

List of Cancer Mage Spells
The following spells count for the Pestilence Savant class feature described above. (spells listed below that are not on the wizard spell list are added for this reason)

Cantrips
Acid Splash
Chill Touch
Mending
Massage
Poison Spray

1st Level
Detect Magic
Disguise Self
False Life
Find Familiar
Grease
Insect Armor (functions as mage armor)
Ray of Sickness
Tasha's Hideous Laughter
Witch Bolt

2nd Level
Alter Self
Beast Sense
Blindness/Deafness
Crown of Madness
Enlarge/Reduce
Hold Person
Melf's Acid Arrow
Ray of Enfeeblement
Spider Climb
Web

3rd Level
Animate Dead
Bestow Curse
Fear
Feign Death
Gaseous Form
Nondetection
Protection from Energy
Stinking Cloud
Tongues
Vampiric Touch

4th Level
Blight
Confusion
Control Water
Evard's Black Tentacles
Fabricate
Giant Insect
Locate Creature
Phantasmal Killer
Polymorph

5th Level
Creation
Dominate Person
Dream
Geas
Hold Monster
Insect Plague
Modify Memory

6th Level
Circle of Death
Create Undead
Disintegrate
Drawmij's Instant Summons
Eyebite
Stone to Flesh

7th Level
Finger of Death
Simulacrum

8th Level
Antipathy/Sympathy
Clone
Control Weather
Feeblemind
Mind Blank
Power Word Stun

9th Level
Power Word Kill
Shapechange
True Polymorph
Weird