Grung

Ability Score Increase. Your Dexterity score increases by 2 and your Constitution score increases by 1.

Age. Grungs mature to adulthood in a single year, but have been known to live up to 50 years.

Alignment. Lawful Neutral

Arboreal Alertness. You have proficiency in the Perception skill.

Size. Grungs stand between 2 ½ and 3 ½ feet tall and average about 30 pounds. Your size is Small.

Speed. You have a walking speed of 25 feet. Your sticky finger and toe pads give you a climb speed equal to your walking speed.

Amphibious. You can breathe air and water.

Poison Immunity. You are immune to poison damage and the poisoned condition.

Venomous Skin. Any creature that grapples you or otherwise comes into direct contact with your skin must succeed on a DC = 10 + your constitution modifier Constitution saving throw or become afflicted by your venom for 1 minute. An afflicted creature which is no longer in direct contact with you can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. The effect depends the color of your skin, which you pick when creating a grung.

Green. A creature afflicted with a green grung's venom becomes poisoned and takes 1d4 poison damage at the start of their turns.

Blue. A creature afflicted with a blue grung's venom must use their action every turn to scream at the top of their lungs.

Purple. A creature afflicted with a purple grung's venom must use all their movement(dashing if able) running towards the closest source of water. If a source of water is not in sight, they instead run in a random direction.

Red. A creature afflicted with a red grung's venom takes 1d8 necrotic damage and has no lasting effects.

Orange. A creature afflicted with a orange grung's venom is frightened of.

Gold. A creature afflicted with a gold grung's venom is charmed by you.

• You can also apply this venom to any piercing weapon as part of an attack with that weapon, when you hit the creature must make a DC = 10 + your constitution modifier Constitution saving throw or become afflicted by your venom for 1 minute.
  

Standing Leap. Your long jump is up to 25 feet and your high jump is up to 15 feet, with or without a running start.

Water Dependency. If you fail to immerse yourself in water for at least 1 hour during a day, you suffer 1 level of exhaustion at the end of that day. You can recover from this exhaustion only through magic or by immersing yourself in water for at least 1 hour.

Languages. You can speak, read, and write Grung.

Grungs are poisonous frog-like amphibious humanoids that live in swamp or marsh forests. 

Adult grungs usually stand at approximately 3 feet (0.91 meters). Males are generally smaller than females. They are small humanoids with strong toad or frog-like legs that ends in webbed feet. Their torsos and heads were less amphibian and more humanoid. They had muscular forelimbs and their hands had opposable thumbs. These creatures stand upright and move about in quick, short hops. Unlike frogs and toads, however, grung are incapable of long leaps.

The evolution of grung gave them intelligence, opposable thumbs, and ingenuity, but took away their prehensile tongues, which are common among other amphibian races. This adaptation left grung with wide, sharp teeth-filled mouths. Their bright-colored skins were kept slick and wet as they breathed through it. Grung eyes are comparatively smaller than those of frogs or toads and were crowned with hard protective ridges. Their eye color is red with black pupils.

Grungs reproduce by laying eggs, which hatch into grey tadpoles which metamorphose into amphibious humanoids over three months, and into adults over another six to nine months by which time their skin has adopted one of a variety of bright colors. Grungs reproduced quickly: And a cheiftain with children in the mid to high hundreds is not uncommon.

Abilities

All grungs continuously secrete a poisonous substance that is harmless to them. This secretion is quite sticky, and grung are easily able to wipe their weapons on their own skin to coat them in this highly toxic substance. When exposed to air, grung venom quickly deteriorated and broke down within a minute, making it extremely hard to harvest and bottle. Their saliva contained the same but weakened poison.

While all grung poisons had similarly debilitating effects, each color of grung poison also caused unique ailments in their victims. Green grungs' poison restricted movement, blue grungs' poison caused prey to shout and yelp against their will, purple grungs' poison drove victims to desperately seek water, red grungs' poison caused ravenous hunger, orange grungs' poison caused irrational fears of one's friends, and gold grungs' poison could charm the victim as well as gift them the ability to temporarily speak the grung language.

Grungs are amphibious, but although they can survive underwater, they are better climbers than swimmers. They need to stay wet at all times as dry skin kills them via suffocation. They need to submerge themselves in water for at least one full hour every day or their health begins to deteriorate. Six days without access to water is sufficient to kill a grung.