我们很难对水蛭生气，尽管它具有相当可怕的本性。它实际上没有智慧，它只会吸附在附近的生物来吸其血液。 去除水蛭需要精密的刀工，或使用明火。但这两种办法都宿主来说也很危险。 当水蛭附着到宿主时，它快速吸血，而宿主会经历饥饿、掉血，并流失耐力。一些水蛭还携带一种危险的疾病，我称之为“沼泽热”，这种疾病的存留时间甚至超过水蛭的寿命。岛上的一些动物是这种疾病的传播者，它只能被一种罕见的药物治愈。
Common name: Leech
Species: Haementeria laetus
It is difficult to be angry with Haementeria laetus, despite its rather terrible nature. The creature has practically no intelligence, and just attaches to any nearby living flesh in an attempt to drain that creature's blood. Removing Haementeria requires precision bladework, or access to an open flame. Both of these can be nearly as dangerous to the host as to the leech itself. Once Haementeria attaches to a host, it drains blood at a rapid pace, and the host experiences hunger, loss of health, and lowered stamina. Some Haementeria are also carriers for a dangerous disease I've dubbed "Swamp Fever," which persists beyond the leech's own lifespan. Few creatures on the Island are transmitters for this disease, and it can ultimately be cured with a rare medicine.
While Haementeria is not intelligent enough to be tamed, it is always useful to keep a few around for antidotes and fishing lures. When processed properly, Haementeria venom can be made into a powerful antivenom!