Cockroach (Common)

Spider Climb. The cockroach can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Hard to Kill. The cockroach's naturally resilient body grants it a measure of protection from death as per the Death Ward spell. Once per long rest, the first time the cockroach would drop to 0 hit points as a result of taking damage, the cockroach instead drops to 1 hit point.

Diseased Touch.  a successful melee attack against a single creature has a chance of inflicting disease upon the target. With each successful attack the target must make a progressively more difficult Constitution saving throw according to the list below.

1st attack - DC 4 | 2nd attack DC 8 | 3rd attack DC 12 | 4th attack and above DC 16 

If the target fails any save the target must roll 1d6  to determine the nature of the disease inflicted according to the list below. The target is subjected to the disease until any effect that removes a disease or otherwise ameliorates a disease's effects apply to it.

1: Blinding Sickness. 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 blinded.

2: Filth Fever. 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.

3: Flesh Rot. The creature's flesh decays. The creature has disadvantage on Charisma checks and vulnerability to all damage.

4: Mindfire. The creature's mind becomes feverish. The creature has disadvantage on Intelligence checks and Intelligence saving throws, and the creature behaves as if under the effects of the confusion spell during combat.

5: Seizure. The creature is overcome with shaking. The creature has disadvantage on Dexterity checks, Dexterity saving throws, and attack rolls that use Dexterity.

6: Slimy Doom. The creature begins to bleed uncontrollably. The creature has disadvantage on Constitution checks and Constitution saving throws. In addition, whenever the creature takes damage, it is stunned until the end of its next turn.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 0 damage and the target must succeed on a Constitution saving throw per Diseased Touch explained above.