Leech

Though valued by apothecaries and field medics as methods to reduce swelling or drain blood, leeches are despised by most who encounter them, regardless of the setting. Young leeches are prized most because their size makes them easier to control in medicinal settings.

Brood Leech Swarm (Creature 4), Giant Leech (Creature 2)

The spotted hooktooth leech is often found in areas frequented by trolls, who sometimes wear them as awful decorations, relying on their regeneration to control the bleeding effects. The gigantic elephant leech feeds on immense beasts of the swamplands or jungles, like elephants and dinosaurs, attacking from unexpected range.