Algae Leshy

Family: Leshy

Huge plant (leshy), neutral

Armor Class 13
HP 18 (4d6 + 4)
Speed 30 ft., swim 40 ft.

15 (+2) 17 (+3) 14 (+2) 16 (+3) 10 (+0) 19 (+4)

Saving Throws Dex +5, Con +3, Wis +4
Skills Athletics +4, Stealth +4 (+5 at night), Survival +3
Senses darkvision 60 ft., passive Perception 11
Languages Common, Druidic, Sylvan
Challenge 2 (450 XP)


  • Plant Speech. algae
  • Plant Form. Small bloom of algae
  • Water Breathing. The Algae leshy can breathe only underwater.
  • Verdant Burst. When the Algae leshy dies, a burst of primal energy explodes from their body, restoring 9 (2d8) hit points to each plant creature in a 30-foot radius. This area immediately fills with algae, becoming difficult terrain. If the terrain is not viable for algae, they wither and die after 24 hours.


  • Multiattack. The Algae leshy makes two attacks on its turn as an action – choosing from its Stalk and Algae Jet attacks.
  • Stalk. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 8 (1d8+4) bludgeoning damage.
  • Algae Jet. Ranged Weapon Attack: +5 to hit, range 20/80 ft., one target. Hit: 6 (1d6+3) poison damage. On a hit, the target is covered in algae and has disadvantage on saving throws against the Algae leshy’s Bioluminescence ability.
  • Bioluminescence The algae covering the Algae leshy begins to glow, producing bright light in a 20-foot radius. All creatures within range must make a DC 13 Wisdom saving throw or become stunned until the end of your next turn.


The term “algae” is applied to a wide range of organisms, from single cells to large plants. Some algae – primarily dinoflagellates – can produce light in a process known as bioluminescence. Algae with this ability create stunning displays of light, capable of defending against potential threats.

The Algae leshy utilizes a similar power, coating its enemies in glowing algae and dazzling them bright lights. If befriended, the Algae leshy can bring some much needed light to dark times. So if you spot a mysterious light in the midst of deep, dark water, don’t worry, it’s probably fine.

Leshy is modeled after an aquatic creature known as the sea slug. These solar powered slugs blur the line between plant and animal in amazing ways, incorporating algae parts into their bodies to perform photosynthesis! This phenomenon, called kleptoplasty, arises when a sea slug eats algae and sequesters its chloroplasts for future use.

Section 15: Copyright Notice

Botanical Bestiary Copyright 2022 Inky Cap Press Author Matt Cavanaugh

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