b'Pyrohydra, Greater \n'b'  Family:   Hydra  \n'b'  Huge   monstrosity ,  unaligned  \n'b'  Armor Class  17 (natural armor)  Hit Points  218 (19d12 + 95)  Speed  30 ft., swim 30 ft.\n'b' STATS STR: 21 (+5) DEX:  12 (+1)  CON:  21 (+5)  INT:  2 (-4)  WIS:  10 (+0)  CHA:  7 (-2)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'     Skills   Perception  +10  Damage Immunities  fire  Senses  darkvision 60 ft., passive  Perception  20  Languages  \xe2\x80\x93  Challenge  16 (15,000 XP) \n'b' Special Traits \n'b'   Hold Breath . The greater pyrohydra can hold its breath for 1 hour. \n'b'  Multiple Heads . The greater pyrohydra has nine heads. While it has more than one head, the greater pyrohydra has advantage on saving throws against being  blinded ,  charmed , deafened,  frightened , stunned, and knocked unconscious. Whenever the greater pyrohydra takes 25 or more damage in a single turn, one of its heads dies. If all its heads die, the greater pyrohydra dies. At the end of its turn, it grows two heads (up to a maximum of eighteen heads) for each of its heads that died since its last turn, unless it has taken acid or cold damage since its last turn. The greater pyrohydra regains 10  hit points  for each head regrown in this way. If the pyrohydra has more than nine heads, it loses one of its heads when it takes a  long rest . \n'b'  Reactive Heads . For each head the elder pyrohydra has beyond one, it gets an extra  reaction  that can be used only for opportunity attacks. \n'b'  Wakeful . While the greater pyrohydra sleeps, at least one of its heads is awake. \n'b'  Actions \n'b'   Multiattack . The greater pyrohydra makes one Bite  attack  with each head. \n'b'  Bite .  Melee Weapon Attack : +10 to hit, reach 10 ft., one target.  Hit : 10 (1d10 + 5) piercing damage plus 5 (2d4) cold damage. \n'b'  Fire Breath  (recharge 5-6). The greater pyrohydra uses all its heads to exhale flame which fills a 25-foot radius sphere centered on a point it chooses within 50 feet of it. Each creature in that area must make a DC 18  Dexterity  saving throw, taking 63 (18d6) fire damage on a failed save or half as much on a successful one.'