leech, giant (Monster Manual)
Small Vermin
Hit Dice: 1d8+1 (5 hp)
Initiative: +1 (Dex)
Speed: 5 ft, swim 10 ft.
AC: 11 (+1 Dex)
Attacks: Touch +1 melee
Damage: Touch 1d6-3
Face/Reach: 5 ft by 5 ft. / 5 ft.
Special Attacks: Attach, anesthetizing mucus, blood drain, disease
Special Qualities: Tremorsense, salt vulnerability
Saves: Fort +3, Ref +1, Will +0
Abilities: Str 4, Dex 13, Con 12, Int , Wis 10, Chr 2
Skills: Hide +13 
Feats: Weapon Finesse (bite)
Climate/Terrain: Temperate and warm aquatic
Organization: Cluster (2-5) or swarm (4-16)
CR: ½
Treasure: None
Alignment: Always neutral
Advancement: 2-4 HD (Small); 5-6 HD (Medium-size)
Giant leeches are horrid, slug-like creatures that dwell in wet, slimy areas and suck the blood of warm-blooded creatures. They typically range from 2 to 3 feet long, though some can grow as large as 5 feet, and their skin is a mottled brown and tan with an occasional shade of grey.
Combat
Leeches wait in the mud and slime for prey to pass by. Generally, there will be some larger leeches (of greater HD) in any given group.
	Attach (Ex): If a leech hits an opponent with its touch attack, it has latched on with its suckered mouth and remains attached. An attached leech loses it Dexterity bonus to AC (it is AC 10 while attached).
	Anesthetizing mucus (Ex): A leech has an anesthetic enzyme in its saliva that prevents warm-blooded creatures from feeling its bite. Creatures in the water who are bitten by a leech must make a Spot check (DC 33) or a Wilderness Lore check (DC 20) to notice being bitten.
	Blood drain (Ex): A giant leech drains blood, doing 1d3 points of temporary Con damage each round that it remains attached. Once it has drained 4 points of Con, it releases its hold and swims off to digest its meal. 
	Disease (Ex): Swamp fever  bite, Fort save (DC 11), incubation period 1d4 days; damage 1d3 temporary Con.
	Tremorsense (Ex): Leeches in the water can automatically detect the presence of anything within 30 feet that is also in contact with the water.
	Salt vulnerability: Leeches are instantly and fatally dehydrated by contact with salt. A handful of powdered salt sprinkled on a giant leech will cause it to detach from a victim immediately and will act upon it as a contact poison  Fortitude save (DC 25), initial and secondary damage 2d6 Con. A heavy local concentration of salt in the water will drive leeches away.