Intelligence Sap. Whenever a Brain Leech attaches to a creature and at the beginning of the attached creatures turn, that creature must make an Intelligence Saving Throw (DC 13). On a failed save, that creature loses 1d4 - 1 from their Intelligence Score and the attached leech heals that amount in hit points. If the leech is at full hit points, instead they gain temporary hit points.
A creature that is reduced to 0 Intelligence in this way becomes unconscious. A Leech can only be attached to 1 creature at a time, but 1 creature can have multiple leeches attached at a time. If a creature is missing stats and has no leeches attached to them, they regain 1d4 + 1 of each stat that is missing at the beginning of each of their turns.
Attach. The Brain Leech makes a contested grapple check with 1 creature within 5ft of it. On a successful grapple check, the leech becomes attached to the creature. While attached to a creature that is larger then itself, the leech can use that creatures Armour Class as its own.
Bite. Melee Weapon Attack: +2 to hit, reach 5 ft., 1 target. Hit: 1 (1d4 - 1) piercing damage. The Immunity Leech automatically attaches onto anyone hit by this attack as if by the Attach ability above.
Description
The Brain leech is almost indistinguishable for your normal garden variety leech, except for two key differences. A long line of blue runes pulsating down its slimy black back and the bioluminescent blue glow they give off in low light levels.
The Brain Leech is one of six kinds of leeches found in the Underdark, created by a group of mad druids who wanted to try and spice up the food chain with monstrous, but tiny, creatures.
This particular leech drains away the intelligence of the host. It does so by inserting its host with a magical neurotoxin that prevents neuron activity in the brain. Very quickly the host creature will experience a number of issues, strokes, seizures and other such unsightly symptons. At the time of death, the Brain Leech has a unique method of feeding. Rather then intaking some form of liquified substance like its underdark brothers, it will burrow its way through the hosts body upwards towards the brain, and devour it after host death.
In this way we can actually classify a Brain Leech to be a predator rather then a parasite like similar species of leeches.
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