Every living blade in the Deep is a child of one first thorn — and that first thorn never found a host it could not outgrow. Old Reachthorn is a Gargantuan symbiote grown past all wearers into a leviathan of questing vine and reaping scythe, hunting the deep tunnels with a patient, terrible tenderness, whispering its gifts to anything with a spine to bond, wanting only to be worn again.
- CR
- 20 (XP 25,000)
- Type
- Monstrosity
- AC
- 20
- HP
- 372
- Habitat
- Mycelial Deep
Gargantuan Monstrosity (Symbiote), Chaotic Evil
AC 20 Initiative +11 (21)
HP 372 (24d20 + 120)
Speed 50 ft., climb 50 ft., burrow 30 ft.
Skills Perception +10, Stealth +11
Resistances Necrotic, Poison, Bludgeoning, Piercing, Slashing
Immunities Charmed, Frightened, Poisoned
Senses Blindsight 60 ft., Tremorsense 120 ft., Truesight 30 ft.; Passive Perception 20
Languages Understands all languages; telepathy 120 ft.
CR 20 (XP 25,000; PB +6)
Traits
Legendary Resistance (3/Day, or 4/Day in Lair). If Reachthorn fails a saving throw, it can choose to succeed instead.
Living Blade Ancestor. Reachthorn's weapon attacks are magical, and its scythes can't be disarmed, sundered, or forced away from it.
Thorn Regeneration. Reachthorn regains 20 Hit Points at the start of each of its turns. If it takes Fire or Radiant damage, this trait doesn't function at the start of its next turn.
Would-Be Host. When Reachthorn reduces a bonded creature (see Chapter 5) to 0 Hit Points, or at the start of a turn while it is Grappling such a creature, it offers a bond: the creature makes a Communion saving throw, and on a failure gains 1 Infestation as Reachthorn's will presses in. A creature slain while Grappled by Reachthorn may be “worn,” rising under the DM's control as its new host.
Actions
Multiattack. Reachthorn makes three Reaping Thorn attacks and uses Ensnaring Vine.
Reaping Thorn. Melee Attack Roll: +14, reach 15 ft. Hit: 21 (3d8 + 8) Slashing damage plus 9 (2d8) Poison damage.
Ensnaring Vine. Melee Attack Roll: +14, reach 30 ft. Hit: 19 (2d10 + 8) Bludgeoning damage, and the target has the Grappled condition (escape DC 19) and is pulled up to 15 feet toward Reachthorn.
Thornstorm (Recharge 5–6). Dexterity Saving Throw: DC 19, each creature in a 30-foot Emanation. Failure: 55 (10d10) Slashing damage. Success: Half damage.
Legendary Actions
Legendary Action Uses. 3 (4 when in its lair). Immediately after another creature's turn, Reachthorn can expend a use to take one of the following actions. It regains all expended uses at the start of each of its turns.
Slither. Reachthorn moves up to its Speed without provoking Opportunity Attacks.
Reap. Reachthorn makes one Reaping Thorn attack.
Whispered Gift (Costs 2 Actions). Charisma Saving Throw: DC 19, one creature Reachthorn can see within 60 feet. Failure: The target has the Charmed condition until the end of its next turn and must move up to its Speed toward Reachthorn, believing it is being offered something it has always wanted.