Dungeons & Dragons 5e Monster : Muunsin, the Gatewarden
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Homebrew
Muunsin, the Gatewarden CR: 21
STR
21 +5
DEX
18 +4
CON
30 +10
INT
20 +5
WIS
20 +5
CHA
25 +7
Spellcasting. Muunsin casts one of the following spells, requiring no material components and using Wisdom as the spellcasting ability (spell save DC 20)
Hear Name. Muunsin hears their name when spoken, regardless of distance or planar boundaries. If a creature speaks their name three times in the same breath, Muunsin learns the creature’s name and precise location, and can hear the following 25 words spoken by that speaker. Once per day, if any living animal or an image or statue of Muunsin is within 10 feet of the speaker, they can answer the speaker via that image, statue, or animal. An animal can resist being made Muunsin’s mouthpiece with a successful DC 20 Wisdom save. Muunsin can also observe, converse, or act through this vessel for up to 666 rounds, but if Muunsin uses an action or bonus action through this link, the connection immediately ends afterward, regardless of any remaining duration.
Special Equipment. Muunsin is equipped with a Breastplate of Balance and a Gulthias Staff. This gear is incorporated into its abilities. Muunsin's AC is 19 (natural armor) without the breastplate.
Blight Bane. While Muunsin is attuned to the Gulthias Staff, blights and other evil plant creatures don't regard it as hostile unless it harms them. Its evil makes beasts visibly uncomfortable while within 30 feet of it.
Non-Euclidian. The space in a 10-foot radius around Muunsin is difficult terrain for humanoids, as its presence warps it into incomprehensible geometries.
Legendary Resistance (3/Day). If Muunsin fails a saving throw, it can choose to succeed instead.
Shapechanger. Muunsin can use its action to polymorph into a Small, Medium, or Large humanoid, or back into its true form. Other than its size and speed, its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.
Actions
Multiattack. Muunsin makes two Gulthias Staff attacks.
Abyssal Rift (Recharge 5–6). Muunsin opens a momentary rift within 120 feet of it. The rift is a 20-foot-radius sphere. Each creature in that area must make a DC 20 Constitution saving throw, taking 40 (9d8) necrotic damage on a failed save, or half as much damage on a successful one. In addition, there is a 50 percent chance that 3 hezrous, 3 intellect snares, or 3 chain devils then appear in unoccupied spaces in the sphere. They act as Muunsin's allies, take their turns immediately after it, and can't summon other creatures. They remain until they die or until Muunsin dismisses them as a bonus action.
Baleful Translocation. Muunsin chooses one creature or object within 30 feet of it. If Muunsin attempts to teleport an object, the object must be able to fit entirely inside a 10-foot cube. If the target is a creature or an object being worn or carried, the creature must make a Charisma saving throw (DC 20) to avoid teleportation. On a failure, the object or the creature and all of its equipment is teleported to a destination that Muunsin can see within 120 feet.
Discorporate. The target makes a Constitution saving throw (DC 20) as Muunsin psychoportively disperses minuscule portions of the target. The target takes (31) 9d6 points of force damage.
Gulthias Staff. Melee Weapon Attack: +12 to hit, one target, 5 ft reach. Hit: 8 (1d6+5) bludgeoning damage or 9 (1d8+5) if wielded with two hands. The staff has 10 charges and regains 1d6 + 4 of its expended charges daily at dusk. On a hit, Muunsin can expend 1 charge to regain a number of hit points equal to the damage dealt by the weapon. Each time a charge is spent, red blood oozes from the staff's pores, and Muunsin must succeed on a DC 12 Wisdom saving throw or be afflicted with short term madness.
Land Gate. Muunsin can swap two sections of terrain that it can see within 120 feet of it. The terrain swapped must be no more than a 10 ft cube. Creatures are not moved along with the swapped terrain.
Bonus Actions
Expunge Imbalance. As a bonus action, Muunsin can expend 2 charges from its Breastplate of Balance to cast the Lesser Restoration spell from the armor. The Breastplate of Balance has 4 charges and regains 1d4 expended charges daily at dawn.
Retroport. Muunsin can recall one creature that teleported since the end of Muunsin's last turn. The creature returns to the point from which it teleported (or the nearest available space, if that space is now occupied the teleported creature can resist being recalled with a successful DC 22 Wisdom save. This save DC is Charisma-based.
Reactions
Counterport. As a reaction, Muunsin can negate any Conjuration (summoning, banishing, or teleportation) spell or effect within 30 ft or redirect creatures to new valid destinations within 30 ft. Affected creatures must make a DC 20 Constitution Saving Throw or take 10d6 points of force damage. On a success, affected creatures take half damage and the Conjuration spell or effect proceeds normally.
Equalize. When Muunsin or a creature it can see within 60 feet of it is about to roll a d20 with advantage or disadvantage, Muunsin can expend 1 charge from its Breastplate of Balance to prevent the roll from being affected by advantage or disadvantage. The Breastplate of Balance has 4 charges and regains 1d4 expended charges daily at dawn.
Legendary Actions
Legendary Action Uses: 3. Immediately after another creature's turn, Muunsin can expend a use to take one of the following actions. Muunsin regains all expended uses at the start of each of their turns.
Unseen Step. Muunsin becomes incorporeal and moves up to 30 feet to an unoccupied space it can see. While incorporeal, it can move through creatures and objects as if they were difficult terrain. It becomes corporeal when it ends its movement. If it ends its movement inside a creature or object, it takes 10 (3d6) force damage and is shunted to the nearest unoccupied space.
Open the Gate (Costs 2 Actions). Muunsin opens a portal, no larger than 5 feet across, to a location within the Dark Dimension or the Astral Plane that is familiar with. A creature within 10 feet of the portal must succeed on a DC 20 Strength saving throw or be pulled through the portal. The creature vanishes momentarily and reappears in a new space of Muunsin's choice within 60 feet of the portal. The creature takes 22 (4d10) force damage upon reappearance.
Cast a Spell. Muunsin casts one of the spells it knows with a casting time of one action.
Suggested Environments
Extraplanar (Dark Dimension, Astral Plane, Ethereal Plane)
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