Brelbork Shroombiter

Spellcasting. Brelbork Shroombiter is a 9th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 12, +4 to hit with spell attacks). Shroombiter has the following warlock spells prepared:
Cantrips (at will): Poison Spray, Eldritch Blast 
1st level (2 slots): Inflict Wounds, Comprehend Languages, Dissonant Whispers
2nd level (2 slots): Hold Person, Mind Spike
3rd level (2 slots): Vampiric Touch, Summon Lesser Demon, Counterspell
4th level (2 slots): Evard's Black Tentacles
5th level (2 slots): Dominate Person

Plague Breath. At the moment Brelbork is reduced to half health or lower, Brelbork will choose an enemy and vomit a jet of demonic bile and will roll a Constitution saving throw. The DC for this saving throw equals 12 (8+CON modifier). If a creature fails, it will take 3d6 poison damage and is considered [condition]poisoned[condition/].

 Zalah's True Contagion. Refer to the segment in Reactions.

Sickle. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 4) slashing damage.

Multiattack. The goblin makes two attacks with its scimitar. The second attack has disadvantage.

I am Your Master!  When a creature is flanked, and it is not an ally’s turn, Brelbork will command up to four of his allies that are flanking a creature of choice. He can do this once a day or use a reaction to do so.

ZTC. Upon dying or close to death, Brelbork will spew forth Zalah’s True Contagion within a 25-foot sphere. Within 25 feet of a dying or dead servant of Zalah, a creature will be inflicted by a natural disease amplified by the Demon of Plagues. In combat, at the end of each target’s turns, the target must make a Constitution saving throw. If they, the creature takes 4d10 poison damage. the creature does not take the damage but will roll 1d6 for one of the diseases below for the duration of the spell unless cured. Zalah's True Contagion lasts for 7 days, unless any spell or potion that ameliorates a disease’s effects apply to this. If any one condition mentioned below is rolled, no other condition will be applied.

• Blinding Scales. Pain grips the creature’s mind, and its eyes turn milky white. The creature has disadvantage on Wisdom checks and Wisdom saving throws and is blind.
• The Pale. A raging fever sweeps through the creature’s body. The creature has disadvantage on Strength checks, Strength saving throws, and attack rolls that use Strength.
• Flesh Lock. The creature’s flesh decays, its muscles stiffen. It is considered paralyzed.
• Brittle-bone. The creature’s bones become frail as if they will shatter at any moment. The creature’s speed is reduced by half as if receiving 2 points of exhaustion.
• The Shakes. The creature is overcome with seizure. The creature must make a death saving throw. Upon a successful roll, it cannot move as if it is incapacitated.
• Redfall. The creature begins to bleed uncontrollably. The creature has disadvantage on Intelligence checks and saving throws as if it confused.