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Giant leeches. They're pretty much what they say, but as I think on them, there's a pretty good chance these things are harvested for their hallucinogenic anticoagulant. The fact it might have a medical purpose is a bonus. Or a downside for people who don't want to give up their drug of choice for "legitimate medical purposes."
Also, they're pretty horrifying. These can be bad news for a group and giant hallucinogenic ambushing leeches don't typically fall into the category of "things adventurers prepare for." But they should and would if they watched more truly awful horror films found on Amazon Prime.
They feed by biting their victims, embedding three daggers sized teeth into their torso, and using a combination of mucus and vacuum to make a seal around their mouths. They then secrete a strong anticoagulant with hallucinogenic properties and feast on the victim’s blood.
DEX: 5 Initiative: 6 Unconsciousness: 39
STR: 5 Physical Defense: 9 Death Rating: 47
TOU: 8 Mystic Defense: 10 Wound Threshold: 129
PER: 5 Social Defense: 10 Knockdown: NA
WIL: 6 Physical Armor: 4 Recovery Tests: 3
CHA: 4 Mystic Armor: 4
Movement: 6 (Swimming 12)
Actions: 1; Bite: 12 (10)
Blood Veins (8): Once attached through use of its Bloodsucker special maneuver, the leech injects its target with a powerful anticoagulant. The victim suffers Step 8 damage each round with no reduction for armor while the leech is attached.
Enhanced Sense [Sight]: Heat Sight
Stealthy Stride (10): As the skill, Player's Guide, p. 170.
Bad Trip (Giant Leech): The giant leech may spend an additional success on an Attack test to inject the target with a hallucinogenic anticoagulant. The target is Harried until the end of the next round. This special maneuver is automatically used if the giant leech starts the round grappling the target.
Bloodsucker (Giant Leech): The giant leech may spend an additional success on an Attack test to latch onto the target and use Blood Veins. This special maneuver is automatically used if the giant leech starts the round grappling the target.
Grab and Bite (Giant Leech)
Pry Loose (Opponent, Close Combat)