b'Urchin Swarm, Ravenous \n'b'\n'b'  Medium swarm of Tiny   beasts ,  unaligned  \n'b'  Armor Class  13 \n'b' Hit Points  72 (16d8) \n'b' Speed  0 ft., swim 20 ft.\n'b' STATS STR: 1 (-5) DEX:  12 (+1)  CON:  10 (+0)  INT:  4 (-3)  WIS:  13 (+1)  CHA:  9 (-1)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Senses  passive  Perception  11 \n'b' Challenge  1 (200 XP) \n'b' Special Traits \n'b'\n'b'  Jet . While underwater, a ravenous urchin swarm can  Dash  as a bonus action and does not provoke opportunity attacks while jetting. It must move in a straight line when it uses this action. \n'b'  Spiky . Each time a creature attacks the urchin swarm in melee with an unarmed  attack  or a natural weapon like a claw or bite, or attempts to grapple or Shove the swarm, takes 1 piercing damage and 2 (1d4) poison damage. \n'b'  Swarm . The swarm can occupy someone else\xe2\x80\x99s space and vice versa. The swarm can fit into any space large enough for a tiny urchin to squeeze through and can use a  reaction  to  attack  any creature that leaves its square with an  attack  of opportunity. \n'b'  Underfoot . Any area containing the swarm is treated as  difficult terrain , and creatures swimming or walking through the swarm must make a DC 11  Dexterity  saving throw or affected by its Spiky ability. \n'b'  Water Breathing . Ravenous urchins can breathe only underwater; however, they can hold seawater inside their bodies when the tide goes out, allowing them to survive until it returns. \n'b'\n'b' Actions \n'b'\n'b'  Spiny Swarm .  Melee Weapon Attack : +3 to hit, range 5 feet, one target.  Hit : 3 (1d4+1) piercing damage and 7 (2d6) poison damage, or half as much on a successful DC 13  Constitution  saving throw. Creatures failing their saving throw also become  poisoned . They can end the  poisoned  effect with a DC 13  Constitution  save each round at the end of their turn, but while  poisoned  have their speed is reduced by half. \n'b'\n'b' Colorful tentacles writhe across this marine creature like long petals on an immense flower. \n'b'  Vermin of the Deep . The largest anemones in the ocean are capable predators despite their plodding movement. They lie in fields of other, usually smaller, anemones and among brightly colored coral societies. Deep tiger anemones feed local scavengers by attacking large prey or schools of fish, scattering uneaten remains to their neighbors.'