Synaptic Leeches are mutualistic symbiotes that typically live short lives (roughly a month). they are a solitary creature resembling the upper part of a humanoid skeleton, specifically the scapula, thoracic and cervical vertebrae. They are very rarely found on the surface, but the few that are, can be found in cemeteries and mausoleums attempting to disguise themselves as bones in order to find suitable hosts. The Synaptic Leech considers most humanoid species as hosts, and won't react to other creatures, even under threat of death. The leech senses hosts through small openings along the scapula which contain its eyes, and upon spotting a suitable host, will jump up at them in an effort to attach to their nervous system. The vertebrae of the Synaptic leech will open up and pinch between the host's vertebrae to attach itself into the spinal cord. In this process, the Synaptic Leech is connected mentally to their host and is able to communicate with them. The process is painful for he host (as is the removal), but Synaptic Leeches provide a boost to the nervous system and physical capabilities that many consider "worth it".   Salvage. Synaptic Leeches have a fluid in their "bones" that can be refined into a Potion of Psychic Resistance when mixed with materials costing 25gp over the course of a short rest.