Slith

The Slith are amphibious aliens that appear in Unreal and Return to Na Pali, and in the Invasion gametype of Unreal Tournament 2004. They are green, serpent-like creatures that can slither around on land and swim very fast under water. They can spit acidic saliva or use their claws to attack their enemies. According to the Unreal manual, they are 12 feet long/tall and weigh 385 lbs on average.

Slith are the Skaarj's amphibian cousins, and they fight alongside them on Na Pali, most commonly throughout the temple of Chizra. In here, the Slith are supposed to be serpents summoned by Chizra to punish the Nali, but in reality they are invaders like the Skaarj. These serpents are also seen swimming around the toxic pools of Terraniux.

In Depth
Health: 210

Slith attack both on land and under water by simply rushing toward their enemy while spitting powerful slime orbs and then finishing it with their claws. On land, their speed is mediocre, but in water, they are capable of finishing humans in seconds. They are very aggressive and engage combats with everyone. They also like to kill nearby Nali before the player has a chance to engage them. Slith are best killed on land if possible. The Stinger and ASMD are the most effective weapons.

Slith are immune to slime pools and the GES from the Bio Rifle. Since the Skaarj are immune to the Bio Rifle's "Bio Mist Cloud" in UC2 it seems the genetic makeup somehow makes the genus less susceptible to the GES's negative effects.

Trivia
During Unreal's development, there were two other class of Slith: Fire Slith and Nitrogen Slith, which were cut from the final game. These two classes had an armored-like skin, respectively red and blue, and were both stronger than the regular Slith. The Fire Slith was immune to lava and spat a different projectile, and the Nitrogen Slith was immune to the frozen damage type.