IADnDMN Stream Monsters! (2019/05/03)

Pteroid

Suggested by @whistlehunter, based on the depicted art by artist Paul Komoda.

A relative of the dreaded fishbear, the pteroid is a bestial, humanoid version of the common lionfish. This creature not only uses its spined for protection, but it can hurl them through its prey to deliver a stabbing wound—with a great dose of venom—from range.

artist credit: Paul Komoda

Agreus

Huge fey, neutral evil

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Armor Class 17 (natural armor)
Hit Points 207 (18d12 + 90)
Speed 50 ft.

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STR	DEX	CON	INT	WIS	CHA
17 (+3)	21 (+5)	21 (+5)	15 (+2)	19 (+4)	25 (+7)

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Saving Throws Str +9, Dex +11, Wis +10, Cha +13
Skills Deception +13, Insight +10, Nature +14, Perception +10, Stealth +11
Damage Resistances poison
Condition Immunities charmed, exhaustion, frightened, poisoned
Senses truesight 15 ft., darkvision 120 ft., passive Perception 20
Languages Common, Druidic, Sylvan
Challenge 19 (22,000 XP)

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Fey Step (Recharge 5–6). As a bonus action, Agreus can teleport up to 30 feet to an unoccupied space he can see.

Legendary Resistances (3/Day). If Agreus fails a saving throw, he can choose to succeed instead.

Magic Resistance. Agreus has advantage on saving throws against spells and other magical effects.

Weapons of the Hunt. Agreus' weapons are magical. When Agreus hits with any of these weapons, the weapon deals an extra 4d8 poison damage (included in the attack). He can conjure or dismiss these weapons at will (no action), causing them to appear or disappear in a plume of leaves. When one of these weapons appears, it appear in his hands, ready to be used.

Actions

Multiattack. Agreus makes any three attacks with his Weapons of the Hunt.

Spear of the Hunt. Melee or Ranged Weapon Attack: +9 to hit, reach 10 ft. or range 30/90 ft., one target. Hit: 13 (3d6 + 3) piercing damage, or 16 (3d8 + 3) if wielded in melee with two hands. On a hit, the target also takes 18 (4d8) poison damage.

Sickle of the Hunt. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 15 (3d6 + 5) slashing damage plus 18 (4d8) poison damage.

Longbow of the Hunt. Ranged Weapon Attack: +9 to hit, range 180/720 ft., one target. Hit: 18 (3d8 + 5) piercing damage plus 18 (4d8) poison damage.

Sickle Boomerangs. Agreus throws his sickles like boomerangs, which travel in a horizontal arc. Agreus chooses up to three creatures he can see within 30 feet of him, which are within 5 feet of each other. Each creature must succeed on a DC 19 Dexterity saving throw, or take 21 (6d6) slashing damage.

Legendary Actions

Agreus can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. Agreus regains spent legendary actions at the start of his turn.

Stalk. Agreus either moves up to half his speed, or uses the Hide action, if able.
Goading Taunt (Cost 2 Actions). Agreus taunts one creature of his choice that can make a melee attack against him and is within melee reach. That creature must succeed on a DC 17 Wisdom saving throw or be forced to use its reaction to make a single melee attack with disadvantage against Agreus. If the attack misses, Agreus then makes a melee attack with advantage against the creature.
Whirlwinds (Costs 2 Actions). Agreus uses his sickles to form two whirlwinds within 5 feet of him, each of which fills a 5-foot cube area. Each whirlwind immediately travels in a straight line for 30 feet before dissipating. Each creature whose space a whirlwind travels through must succeed on a DC 19 Strength saving throw or be pushed 5 feet in a andom direction and knocked prone.

Compost Slug

Gargantuan monstrosity, unaligned

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Armor Class 10 (natural armor)
Hit Points 245 (14d20 + 98)
Speed 20 ft., burrow 10 ft.

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STR	DEX	CON	INT	WIS	CHA
21 (+5)	4 (-3)	25 (+7)	2 (-4)	8 (-1)	4 (-3)

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Saving Throws Str +9, Con +11
Damage Resistances bludgeoning
Damage Immunities poison
Condition Immunities poisoned
Senses tremorsense 120 ft., passive Perception 9
Languages —
Challenge 10 (5,900 XP)

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Carrion Feeder. If the slug starts its turn within 15 feet of a Medium or larger corpse, and has at least one tentacle free it can eat that corpse as a bonus action, regaining 11 (2d10) hit points.

Compost Gasses. When the slug takes piercing damage, the wound emits a small plume of poisonous gas from the decomposing material inside its body. Each creature within 5 feet of the slug must succeed on a DC 15 Constitution saving throw or take 7 (2d6) poison damage.

    If the slug has half of its hit points remaining or fewer, each time it takes fire damage, roll a d10. On a result of 10, the slug ignites and explodes. The slug is instantly killed, and each creature within 20 feet of it must succeed on a DC 15 Dexterity saving throw or take 28 (8d6) fire damage. Any creatures swallowed by the slug have disadvantage on their saving throws.

Keen Smell. The slug has advantage on Wisdom (Perception) checks that rely on smell.

Actions

Multiattack. The slug makes four tentacle attacks.

Tentacle. Melee Weapon Attack: +9 to hit, reach 15 ft., one target. Hit: 15 (4d4 + 5) bludgeoning damage, and the target is grappled (escape DC 15). At the start of the slug's next turn, it can pull the grappled creature to within 5 feet of it (no action).

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 23 (4d8 + 5) piercing damage.

Swallow. The slug makes one bite attack against a Large or smaller target it is grappling. If the attack hits, the target is swallowed, and the grapple ends. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside the slug, and it takes 10 (4d4) acid damage at the start of each of the slug's turns. If the slug dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 5 feet of movement, exiting prone.