Stalker

 is an enemy in The Sandbox Evolution.

Summary
An agile variant of the Zombie

Abilities

 * Swipe attack - Will swipe the hero and NPCs.
 * Agility - Moves fast once it detects a victim.
 * Climb - Can climb walls and obstacles.
 * Convert - Will convert NPCs it kills into Zombies.

Trivia

 * Is immune to drowning, since it is already dead.
 * Despite being organic, it is also immune to Acid, Fire and Lava.