Brood Leech SwarmCreature 4
Source Pathfinder Bestiary 2
Perception +9 (tremorsense 30 feet)
Languages none
Skills Athletics +8, Stealth +11
Str +0, Dex +3, Con +4, Int -5, Wis +1, Cha -5
AC 19; Fort +12; Reflex +11; Will +9;
HP 40
Speed 5 feet (swim 20 feet)
Immunities precision, swarm mind
Weaknesses Area Damage 5, Salt 5, Splash Damage 5
Resistances Bludgeoning 2, Piercing 5, Slashing 5
Tremorsense 30 feet
Tremorsense allows a monster to feel the vibrations through a solid surface caused by movement. It is an imprecise sense with a limited range (listed in the ability). Tremorsense functions only if the monster is on the same surface as the subject, and only if the subject is moving along (or burrowing through) the surface.
Swarm MindThis monster doesn't have a single mind (typically because it's a swarm of smaller creatures), and is immune to mental effects that target only a specific number of creatures. It is still subject to mental effects that affect all creatures in an area.
Blood Draining Bites
Each enemy in the swarm's space takes 2d6 Persistent Bleed Damage and is exposed to brood leech swarm venom.
Brood Leech Swarm Venom (poison)Saving Throw DC 21 fortitude
Maximum Duration 6 rounds
Stage 1 Clumsy 1, Sickened 1, and -5-foot status penalty to Speed (1 round)
Stage 2 Clumsy 1, Sickened 1, and -10-foot status penalty to Speed (1 round).
Most smaller species of leeches do not tend to swarm, but brood leeches are prone to gathering in seething, undulant mats of squirming gluttony. When they gather in sufficient numbers to swarm, they eschew the stealth of a lone leech's feeding methods in favor of swift and merciless feeding. In these situations, their mild venom can affect much larger creatures than their usual prey.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AmphibiousAn amphibious creature can breathe in water and in air, even outside of its preferred environment, usually indefinitely but at least for hours. These creatures often have a swim Speed. Their bludgeoning and slashing unarmed Strikes don't take the usual -2 penalty for being underwater.