Madness. The arcanist has gone insane due to the containts of the Manual of Lichdom and has the following madness effects:

• The arcanist has vivid hallucinations and has disadvantage on ability checks.
• The arcanist feels compeled to repeat a specific activity, in this case reading the Manual of Lichdom.
• The arcanist has the following flaw: "I am the only one that must know the secrets of Manual of Lichdom, and I must have the ritual perfectly memorize before I perform it."

Mad Spellcasting. The arcanist is a 17th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17,  +9  to hit with spell attacks). Whenever the arcanist attempts to cast a spell, roll 1d10. The arcanist casts the designated, as listed below. The arcanist can cast its spells at will.

Turn Resistance. The arcanist has advantage on saving throws against any effects that turn undead.

Teleport. The arcanist magically teleports, along with any equipment it is wearing or carrying, up to 120 ft. to an unoccupied space that it can see.

Paralysing Touch. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 15 (3d6 + 5) cold damage. The target must succeed on a DC 17 Constitution saving throw or be paralysed until the end of the arcanist's next turn. The target can repeat the saving throw at the beginning of its turn, ending the condintion on o successful one.