Abyssal Plague

Apperance

A crimson crystal substance, either in liquid or solid form, is somehow incorporated into the creature's body. The crimson substance contains strands of silver and flecks of gold, and it appears as either an oozing liquid or as hard as an armoured shell. The substance might manifest as veins of pulsating liquid crystal running between armoured plates or undulating from cracks in the skin, solid crystal protrusions, The creature's jaw splits in two down the middle, and it gains additional sets of smaller eyes, while the main eyes elongate and glow with sulphuric light. Moreover, they gains two additional forelimbs.   Proficiencies. Ravaged by the disease, plague demons lose the ability to use armour, shields, tools, or weapons.   Spellcasting. The ability to cast all spells is lost to plague demons, with the exception of innate spells.   Type. The creature's type changes to fiend (demon).   Alignment. The plague demon's alignment is chaotic evil.   Armour Class. The plague demon gains natural armour, which is determined by its size.   Plague Demon Plague demons are creatures that have been turned into fiends by the abyssal plague. Regardless of their race, all plague demons have similar features and appearance, gaining special senses, resistance to destructive energy, and a body riddled with disease. Plague Born. Unlike normal demons, plague demons aren't extensions of the Abyss of their formar world. As a result, plague demons do not reconstitute after death, and their corrupted souls are devoured by the Voidharrow.   Mad Drive. Plague demons are driven mad by the abyssal plague, causing them to rage and leash out at any and everything that moves. A sentient creature retains some iota of intellect, but is driven by the same maddening instinct, overcomed by an alien hunger to kill, devourer, and spread the plague even further.   Sample Plague Demon Here is an example of a plague demon where the template below has been applied to a human commoner to create a standard plague demon. Small or Tiny 12 + Dex modifier Medium 14 + Dex modifier Large or larger 14 + Con modifier Hit Points. The creature's hit point maximum is reset to full. and the number of hit dice it has increases by 2, its hit points increasing by proportion (MM page 7, Hit Points).   Speed. Reduce all the creature's forms of movement speeds by 5 feet, to a minimum of 20 feet.   Ability Scores. Increase the creature's Strength, Constitution, and Widsom scores by 2; decrease its Dexterity, Intelligence, and Charisma scores by 2.   Saving Throws. The plague demon has proficiency in Constitution and Wisdom saving throws.   Damage Resistances. The creature gains resistance to cold, fire, and lightning damage.   Damage Immunities. The creature gains immunity to poison damage.   Condition Immunities. The plague demon can't be chamred or poisoned.   Senses. The creature gains darkvision with a radius of 60 feet. If it already has darkvision, increase it by 60 feet.   Languages. The plague demon speaks Abyssal in addition to any other languages it knows.   Challange. To get the CR of the plague demon, increase the creature's CR by 2.   Aggressive. As a bonus action, the plague demon can move up to its speed toward a hostile creature that it can see.   Madden Fury. The plague demon deals an extra 3 weapon damage when it hits with a melee attack.   Plague Riddled. Whenever the plague demon deals necrotic damage to a creature with a melee attack using its natural weapons, the target must succeed on a Constitution saving throw or be infected with stage 1 of the abyssal plague, the DC of which is equal to 10 + the plague demon's proficientcy bonus.   Actions Ignore changing any particular action if the creature already possesses a similar action, with the exception of adding necrotic damage to attacks that do so.   New Action: Multiattack. The plague demon makes one bite attack and one claw attack.   New Action: Bite. The creature gains natural weapons in the form of razor-sharp teeth. Use the Strength modifier for the attack and damage rolls; the range and damage dice are determined by its size as shown below.   Size Damage Dice Small or Tiny 1d4 piercing + 1 necrotic Large or Medium 1d6 piercing + 1d4 necrotic Huge 2d4 piercing + 1d6 necrotic Gargantuan 2d6 piercing + 1d8 necrotic New Action: Claw. The plague demon gains natural weapons in the form of four razor-sharp claws. Use the Strength modifier for the attack and damage rolls; the range and damage dice are determined by its size.   Size Damage Dice Small or Tiny 2d4 slashing Large or Medium 2d6 slashing Huge 4d4 slashing Gargantuan 4d6 slashing Size Range Large or smaller 5 feet Huge 10 feet Gargantuan 15 feet Additional Traits If the plague demon's CR is equal to or higher than a certain threshold, it gains additional traits when it turns into a plague demon:   CR 9 of higher Senses. Instead of darkvision, the plague demon instead gains truesight with a range of 60 feet. If it already has truesight, increase the range by 60 feet.   Languages. The plague demon gains telepathy with a range of 60 feet. If it already has telepahty, increase the range by 60 feet.   Plague Burst. When the plague demon dies, it explodes in a burst of blood and disease. Each creature within 5 feet of it must make a Constitution saving throw or be infected with stage 1 of the abyssal plague, the DC of which is equal to 10 + the plague demon's proficientcy bonus.   New Action: Multiattack. The plague demon now makes one bite attack and two claw attacks.   CR 11 or higher Magic Resistance. The plague demon has advantage on saving throws against spells and other magical effects.   New Action: Multiattack. The plague demon now makes one bite attack and three claw attacks.   New Action: Claw. One of the damage dice for the plague demon's claw attacks now deals necrotic damage.