b'Bone Colossus \n'b'  Gargantuan   undead ,  chaotic evil  \n'b'  Armor Class  16 (natural armor)  Hit Points  181 (11d20 + 66)  Speed  30 ft.\n'b' STATS STR: 24 (+7) DEX:  11 (+0)  CON:  22 (+6)  INT:  14 (+2)  WIS:  16 (+3)  CHA:  16 (+3)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Saving Throws   Con  +11,  Wis  +8  Skills   Intimidation  +13,  Perception  +8  Damage Resistances  bludgeoning, piercing, and slashing from nonmagical attacks  Damage Immunities  necrotic, poison  Condition Immunities   charmed ,  exhaustion ,  frightened ,  paralyzed ,  poisoned   Senses   darkvision  120 ft., passive  Perception  18  Languages  Common, Darakhul  Challenge  13 (10,000 XP) \n'b' Special Traits \n'b'\n'b'  Collective Mind . The bone colossus\xe2\x80\x99 individual posthumes are connected via a hive mind. It can telepathically communicate with any of its individual posthumes within 50 miles of it, and it can\xe2\x80\x99t be surprised. If the bone colossus is reduced to half its  hp  or fewer, its  Intelligence  score is reduced to 1. \n'b'  Siege Monster . The bone colossus deals double damage to objects and structures. \n'b'  Swarm Form . A bone colossus can use its action to split into four individual swarms of tiny bone posthumes. Each swarm has an hp total equal to the bone colossus\xe2\x80\x99 hp divided by 4 (rounded down), and all are affected by any conditions, spells, and other magical effects that affected the bone colossus. The swarms act on the same  initiative  count as the bone colossus did and occupy any unoccupied space that previously contained the bone colossus. A  bone swarm  can occupy another creature\xe2\x80\x99s space and vice versa, and the swarm can move through a space as narrow as 1 foot wide without squeezing. A swarm can\xe2\x80\x99t regain  hp  or gain  temporary hp . As an action, the swarms can reform into a single bone colossus as long as all surviving swarms are within 5 feet of each other. The reformed bone colossus\xe2\x80\x99 hp total is equal to the combined remaining hp of the swarms, and the bone colossus is affected by any conditions, spells, and other magical effects currently affecting any of the swarms. It occupies any unoccupied space that previously contained at least one of the swarms that formed it. \n'b'  Turn Resistance . The bone colossus has advantage on saving throws against any effect that turns undead. \n'b'\n'b' Actions \n'b'\n'b'  Multiattack . The bone colossus makes two attacks. \n'b'  Thunderous Slam (Colossus Form Only) .  Melee Weapon Attack : +12 to hit, reach 15 ft., one target.  Hit : 29 (4d10 + 7) bludgeoning damage plus 10 (3d6) thunder damage, and the target must succeed on a DC 18  Strength  saving throw or be knocked  prone . \n'b'  Razor Teeth (Swarm Form Only) .  Melee Weapon Attack : +12 to hit, reach 0 ft., one target in the swarm\xe2\x80\x99s space.  Hit : 21 (6d6) piercing damage, or 10 (3d6) piercing damage if the swarm has half its  hp  or fewer. \n'b'\n'b' About \n'b' Necromancers, both living and dead, sometimes come together to make massive undead creatures known collectively as \xe2\x80\x9cnecrotech\xe2\x80\x9d. In nations ruled by undead, these massive creations often act as siege weapons or powerful modes of transportation. \n'b'  Bone Colossuses . In a tome of deranged ramblings, it was theorized how \xe2\x80\x9cposthumes\xe2\x80\x9d- the tiny skeletal creatures used to make up bone collectives-might be gathered in even greater numbers to form bigger, stronger creatures. Thus was born the bone colossus, an undead creature big and powerful enough to serve as a rallying point for undead legions in battle. \n'b'  Death Barques . The death barque is built in the form of a ship to combat the dangers of the seas and to spearhead naval confrontations of undead nations. Its body is constructed from hardened  purple worm  hides stretched taut over the ribcage of a giant subterranean shark. Its figurehead was once a gypsosphinx while its tail belonged to a  cave dragon . Death barques typically carry a dozen zombies armed with glaives and chained to the barque\xe2\x80\x99s deck with hooks through their flesh to prevent them becoming lost overboard. But it\xe2\x80\x99s the death barque itself that is the true threat. Its sphinxlike figurehead is capable of breathing a deadly cone of necrotic energy, and its spiked tail can launch explosive bone shards at its enemies. \n'b'  Undead Nature . Necrotech doesn\xe2\x80\x99t require air, food, drink, or sleep.'