Blood Drain◆Requirements The giant leech has a living creature Grabbed or Restrained
Effect The giant leech drains blood from the creature it has grabbed or restrained. This deals 2d4 piercing damage (DC 18 basic Fortitude save). A creature that takes any damage from having its blood drained by a giant leech is Drained 1 until it receives any kind or amount of healing.
Grab◆
Source: Pathfinder Monster Core 2
Running this fight? Add the giant leech to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.