Ancient Forest Guardian

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Huge Plant, Neutral Good

Armor Class 18 (natural armor)

Hit Points 210 (20d12+80)

Speed 40 ft.

STR 26 (+8)

DEX 10 (+0)

CON 18 (+4)

INT 12 (+1)

WIS 16 (+3)

CHA 14 (+2)

Saving Throws Con +8, Wis +7

Skills Nature +5, Perception +6

Damage Resistances bludgeoning; piercing; slashing

Damage Immunities poison, disease

Condition Immunities charmed, frightened

Senses darkvision 60 ft., passive Perception 16

Languages Common, Elvish, Druidic

Challenge 10 (5,900 XP) Proficiency Bonus +4

Legendary Resistance (3/Day). If the Ancient Forest Guardian fails a saving throw, it can choose to succeed instead.

Rooted Defense. When the Ancient Forest Guardian is standing on natural terrain, it has advantage on attacks against creatures that attack it in melee.

Regeneration. The Ancient Forest Guardian regains 10 hit points at the start of its turn if it has at least 1 hit point.

Innate Spellcasting. Ancient Forest Guardian's spellcasting ability is Wisdom (spell save DC 16, +8 to hit with spell attacks). It can innately cast the following spells:

1/day each: tree stride, wrath of nature

2/day each: barkskin, stone skin

At will: entangle, healing word

Actions

Multiattack. The Ancient Forest Guardian makes two Slam attacks.

Slam. Melee weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 29 (4d10+7) bludgeoning damage. A powerful strike with its massive limbs.

Vine Whip. Melee weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 14 (2d8+5) slashing damage. The guardian lashes out with a whip-like vine.

Earth's Embrace (Recharge 5-6). The Ancient Forest Guardian roots into the ground and summons a protective barrier of earth. This grants it temporary hit points equal to 3d10 + its Wisdom modifier, which lasts until the start of its next turn.

Legendary Actions

The Ancient Forest Guardian can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The guardian regains spent legendary actions at the start of its turn.

Detect. The Ancient Forest Guardian makes a Wisdom (Perception) check.

Regrow (Costs 2 Actions). The Ancient Forest Guardian regains 10 hit points.

Entangling Grasp (Costs 2 Actions). The Ancient Forest Guardian attempts to restrain a creature within 15 feet. The target must succeed on a DC 16 Strength saving throw or be restrained until the end of its next turn.

Environment Forest, Mountain

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Lore & Description

Appearance

The Ancient Forest Guardian is a towering creature, its bark-like skin resembling that of ancient trees. It has thick, sprawling roots and massive branches adorned with lush foliage. The guardian's eyes glow with a vibrant green light, exuding an aura of life and protection.

Behavior & Origins

This ancient being has stood watch over its forest for centuries, protecting it from any who would bring harm. It communicates with the flora and fauna around it, guiding lost travelers or punishing those who disrespect nature. The Ancient Forest Guardian serves as a guardian and arbiter of the forest, embodying the spirit of the wilderness.

Monster Image

Generation Info

Original prompt:
"A treant ancient guardian of the forest"

Created: Jan 28, 2026
Modified: May 31, 2026