Conch Tree

Large plant, unaligned

Armor Class 16 (natural armor)
Hit Points 94 (9d10 + 45)
Speed 0 ft.

23 (+6) 8 (-1) 21 (+5) 1 (-5) 16 (+3) 1 (-5)

Damage Resistances bludgeoning, piercing
Damage Vulnerabilities fire
Senses blindsight 60 ft., passive Perception 13
Challenge 7 (2,900 XP)


  • False Appearance. While the conch tree remains motionless, it is indistinguishable from a normal seaweed bed.
  • Water Breathing. The conch tree can breathe only underwater.


  • Multiattack. The conch tree makes two harpoon tentacle attacks.
  • Harpoon Tentacle. Melee or Ranged Weapon Attack: +10 to hit, range 60 ft., one target. Hit: 28 (4d10 + 6) piercing damage. If the target is a Medium or smaller creature, it must succeed on a DC 15 Dexterity saving throw or be reeled into the seaweed mass that makes up the conch tree and be swallowed whole. This triggers the collapse ability of the conch tree. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the tree, and it takes 7 (2d6) bludgeoning and 3 (1d6) acid damage at the start of each of the conch tree’s turns. If the conch tree takes 10 (3d6) damage or more on a single turn from a creature inside it, the conch tree must succeed on a DC 17 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the tree. If the tree dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 20 feet of movement, exiting prone.


  • Collapse. Once a conch tree swallows a creature whole, it can collapse into a smaller hard shell to protect itself while it digests its prey. The tree curls around its prey, reinforcing its own outer flesh and changing colors to represent mud or stone. It gains a damage threshold of 10 and a +20 bonus on Dexterity (Stealth) checks while on the ocean floor.


Several stalks of thick seaweed rise from the ocean floor, with large round stones decorating the silt nearby.

Cadaverous Reproduction. Conch trees reproduce by implanting a single seed in a partially digested corpse. The corpse is then expelled so the seed can absorb nutrients from it before sprouting and taking root. Conch trees never stop growing, but an average adult specimen is 20 feet tall.

Sea Treants. Conch trees are frequently cultivated as living barriers, unsporting hedges against unwanted incursions. After centuries of breeding and experimentation, they developed an instinct for discerning regular travelers among their groves from visiting prey. In the wild, entire schools of fish can vanish instantly over a conch grove.

Section 15: Copyright Notice

Legendary Planet Adventure Path (5E) © 2020, Legendary Games; Authors: Matt Goodall, Jim Groves, Steven T. Helt, Tim Hitchcock, Jason Nelson, Richard Pett, Tom Phillips, Mike Shel, Neil Spicer, Mike D. Welham

Sea Monsters (5E) © 2021, Legendary Games; Authors Michael Ritter, Michael “solomani” Mifsud, Robert J. Grady, Mark Hart, Jeff Ibach, Alex Riggs, Scott D. Young, Jeff Lee, Matt Kimmel, and Jason Nelson.

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