b'Siren\xe2\x80\x99s Tail \n'b'  Medium   aberration ,  chaotic neutral  \n'b'  Armor Class  11  Hit Points  18 (4d8)  Speed  30 ft., swim 30 ft.\n'b' STATS STR: 12 (+1) DEX:  13 (+1)  CON:  11 (+0)  INT:  2 (-4)  WIS:  10 (+0)  CHA:  3 (-4)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Skills   Perception  +2,  Stealth  +3  Senses   darkvision  30 ft., passive  Perception  12  Challenge  \xc2\xbc (50 XP) \n'b' SPECIAL TRAITS \n'b'\n'b'  Amphibious . The siren\xe2\x80\x99s tail can breathe air and water. \n'b'  Symbiotic Bond . When the siren\xe2\x80\x99s tail is attached to a host, the host gains the following properties. The host can breathe underwater and gains a swim speed equal to twice their walking speed. They retain their normal mode of respiration. They ignore the effects of  difficult terrain  and standing up from  prone  costs no movement. \n'b'\n'b' ACTIONS \n'b'\n'b'  Bite .  Melee Weapon Attack : +3 to hit, reach 5 ft., one target.  Hit : 4 (1d6 + 1) piercing damage. The target is  grappled  (escape DC 11). Until this grapple ends, the target is  restrained , and the siren\xe2\x80\x99s tail can\xe2\x80\x99t bite another target. If the creature remains  grappled  in this way for 1 minute, it becomes the siren\xe2\x80\x99s tail\xe2\x80\x99s host. \n'b'  Swallow . The siren\xe2\x80\x99s tail makes one bite  attack  against a Small or smaller target it is grappling. If the  attack  hits, the target is swallowed and the grapple ends. The swallowed target is  blinded  and  restrained , it has total  cover  against attacks and other effects outside the siren\xe2\x80\x99s tail, and it takes 5 (2d4) acid damage at the start of each of the tail\xe2\x80\x99s turns. The tail can have only one target swallowed at a time. If the tail dies, a swallowed creature is no longer  restrained  by it and can escape from the corpse using 5 feet of movement, exiting  prone . \n'b'\n'b' ABOUT \n'b' Named for the unique appearance they give their hosts, siren\xe2\x80\x99s tails are water-dwelling aberrations that bind to other creatures by consuming their lower body. Once a host\xe2\x80\x99s lower extremities have been digested, the creature becomes completely reliant on the siren\xe2\x80\x99s tail for survival. Hosts of these aberrations can be mistaken for  merfolk  from afar, but proximity always reveals the giant leech that consumes its host. \n'b'  Fluid Dependent . Siren\xe2\x80\x99s tails rely on a constant intake of fluids, whether from a watery environment or a host\xe2\x80\x99s blood supply. To this end, a siren\xe2\x80\x99s tail causes its host to constantly thirst and produce more blood, making sure it always has an ample supply of fluids when out of the water. Though not always immediately noticeable, this process makes a host\xe2\x80\x99s skin semi-translucent and causes it to produce light layers of mucus, which most will simply mistake for excessive sweat. \n'b'  Muscular Form . Despite its flexibility and grace, a siren\xe2\x80\x99s tail is composed of dense muscle, making it a force to be reckoned with both in and out of the water. In combat, siren\xe2\x80\x99s tails make more use of their body as a weapon than they do of their mouths, which exist mainly for the purpose of binding to hosts. Creatures that find themselves bound to a siren\xe2\x80\x99s tail can learn to make great use of its musculature both for combat and traversing complex terrain. \n'b'  Alien Influence . The siren\xe2\x80\x99s tail gives its host the following flaw: \xe2\x80\x9cI possess a thirst that is never quenched and have a persistent desire to return to the water.\xe2\x80\x9d'