5E D&D Fearsome Critter: Augerino (Serpentes Spirillum)
 
 This is the latest entry in a series of creatures I converted for Fifth Edition Dungeons & Dragons from the North American myths and legends known as Fearsome Critters. You can download all 50+ monsters here
This gigantic, corkscrew-shaped worm tunnels relentlessly towards water.

Augerinos are sand-dwelling worms that abhor water and react violently to dams and irrigation ditches. As such, they use their screw-like heads to bore holes in any water container they encounter. They line their tunnels with silica, which they extrude as they pass, to shore up the tunnels they leave behind. The tunnels of passing augerinos make for a surprisingly rich underground ecosystem inhabited by all sorts of life that moves in after the augerino has left.

Augerino

Gargantuan   monstrosity, unaligned

Armor Class 18 (natural armor)
Hit Points 247 (15d20+90)
Speed 50 ft., burrow 30 ft.

STR | DEX | CON | INT | WIS | CHA    

28 (+9) | 7 (-2) | 22 (+6) | 1 (-5) | 8 (-1) | 4 (-3)

Damage Immunities bludgeoning,   piercing and slashing from non-magical weapons

Saving Throws Con +11,   Wis +4

Senses blindsight 30 ft.,   tremorsense 60 ft., passive Perception 9
Challenge 14 (11,500 XP)

Harmed by Running Water. The augerino   takes 20 acid damage if it ends its turn in running water.

Siege Monster. The augerino deals double damage to objects   and structures.

Tunneler. The augerino can burrow through solid rock at   half its burrow speed and leaves a 10-foot-diameter tunnel in its wake.

Water Susceptibility. For every 5 feet the augerino moves in water,   or for every gallon of water splashed on it, it takes 1 acid damage.

ACTIONS

Corkscrew. Melee Weapon Attack: +9 to hit, reach 10 ft.,   one target. Hit: 22 (3d8 + 9) piercing damage.

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