Languages: understands Deep Speech but can't speak
Challenge: 15 (13,000 XP)
Abilities
Tunneler: The Gravemaw Colossus can burrow through solid rock at half its burrow speed and leaves a 10-foot-diameter tunnel in its wake.
Stone Camouflage: The Gravemaw Colossus has advantage on Dexterity (Stealth) checks made to hide in rocky terrain.
Actions
Multiattack: The Gravemaw Colossus makes two attacks with its claws and one with its bite.
Claw: Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 16 (2d8 + 7) slashing damage.
Bite: Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 24 (3d10 + 7) piercing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 21). Until this grapple ends, the target is restrained, and the Colossus can't bite another target.
Earth Eruption (Recharge 5–6): The Gravemaw Colossus burrows into the ground and erupts from it in a location of its choosing within 60 feet. Any creature within 20 feet of the eruption must make a DC 19 Dexterity saving throw. On a failed save, a creature takes 33 (6d10) bludgeoning damage and is knocked prone. On a successful save, a creature takes half as much damage and isn't knocked prone.
The Gravemaw Colossus is a gargantuan aberration that instills terror at first sight. Its body is a blend of rock, earth, and muscular sinew, standing over 30 feet tall. The creature is primarily quadrupedal but can rear onto its hind legs to reach terrifying heights.
Its skin is a dark grey, almost stone-like in appearance, covered in jagged plates that provide a natural armor. The Gravemaw Colossus's broad body is lined with spiny protrusions, like stalagmites and stalactites jutting out from its rocky hide, adding an extra layer of protection and making it blend perfectly with the subterranean surroundings.
The Gravemaw Colossus's head is dominated by a massive maw, hence its name. This terrifying orifice is filled with multiple rows of razor-sharp, stone-like teeth, each one as large as a full-grown dwarf. Its eyes are pitch black, except when it opens its maw, where a faint eerie glow emanates from its throat, reflecting off its eyes.
Its claws are massive, each one akin to a miner's pickaxe, able to tear through solid stone as if it were soft clay. These claws allow it to burrow through the earth with terrifying speed and to launch surprise attacks on unsuspecting victims.
When the Gravemaw Colossus moves, it does so with a thunderous rumble, causing the ground to quake beneath its enormous weight. The presence of this monstrosity is announced by tremors, collapsing tunnels, and the deafening roar it produces from its gaping maw.
Damage Resistances: bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities: charmed, frightened
Senses: truesight 120 ft., passive Perception 21
Languages: all, telepathy 120 ft.
Challenge: 15 (13,000 XP)
Abilities
Hover: The Luminant Leviathan can hover in place without needing to move.
Incorporeal Movement: The Luminant Leviathan can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Illumination: The Luminant Leviathan sheds bright light in a 30-foot radius and dim light for an additional 30 feet.
Actions
Multiattack: The Luminant Leviathan makes two Light Lash attacks.
Light Lash: Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) radiant damage.
Radiant Beam (Recharge 5-6): The Luminant Leviathan fires a beam of concentrated light in a line that is 60 feet long and 5 feet wide. Each creature in that line must make a DC 19 Dexterity saving throw, taking 45 (10d8) radiant damage on a failed save, or half as much damage on a successful one.
Legendary Actions
The Luminant Leviathan 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. The Luminant Leviathan regains spent legendary actions at the start of its turn.
Detect: The Leviathan makes a Wisdom (Perception) check.
Radiant Pulse (Costs 2 Actions): The Luminant Leviathan emits a burst of radiant energy. Each creature within 10 feet of it must succeed on a DC 19 Constitution saving throw or be blinded until the end of the creature's next turn.
Teleport (Costs 3 Actions): The Luminant Leviathan magically teleports, along with any equipment it is wearing or carrying, up to 60 feet to an unoccupied space it can see.
The Luminant Leviathan is a celestial fiend that illuminates the dark caverns of the Underdark. Unlike the Gravemaw Colossus, which relies on physical prowess and burrowing ability, the Luminant Leviathan uses radiant energy and its superior intellect. This beast thrives in the same environment but in a radically different way, representing the antithesis of the Gravemaw. As both creatures roam the same territory, their paths often cross, leading to cataclysmic encounters deep within the earth.
You know, I’m pretty sure you can use the tools to homebrew such a monster and either link to it or share it via Imgur or something. It would save a lot of space.
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Monster: Gravemaw Colossus
Size: Gargantuan
Type: Aberration
Alignment: Chaotic Evil
Armor Class: 18 (natural armor)
Hit Points: 325 (25d20+100)
Speed: 40 ft., burrow 40 ft.
STR: 25 (+7)
DEX: 14 (+2)
CON: 20 (+5)
INT: 7 (-2)
WIS: 15 (+2)
CHA: 10 (+0)
Saving Throws: Con +11, Wis +8, Cha +6
Skills: Perception +8, Stealth +8
Damage Resistances: bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities: charmed, frightened
Senses: darkvision 120 ft., tremorsense 60 ft., passive Perception 18
Languages: understands Deep Speech but can't speak
Challenge: 15 (13,000 XP)
Abilities
Tunneler: The Gravemaw Colossus can burrow through solid rock at half its burrow speed and leaves a 10-foot-diameter tunnel in its wake.
Stone Camouflage: The Gravemaw Colossus has advantage on Dexterity (Stealth) checks made to hide in rocky terrain.
Actions
Multiattack: The Gravemaw Colossus makes two attacks with its claws and one with its bite.
Claw: Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 16 (2d8 + 7) slashing damage.
Bite: Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 24 (3d10 + 7) piercing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 21). Until this grapple ends, the target is restrained, and the Colossus can't bite another target.
Earth Eruption (Recharge 5–6): The Gravemaw Colossus burrows into the ground and erupts from it in a location of its choosing within 60 feet. Any creature within 20 feet of the eruption must make a DC 19 Dexterity saving throw. On a failed save, a creature takes 33 (6d10) bludgeoning damage and is knocked prone. On a successful save, a creature takes half as much damage and isn't knocked prone.
Appearance:
The Gravemaw Colossus is a gargantuan aberration that instills terror at first sight. Its body is a blend of rock, earth, and muscular sinew, standing over 30 feet tall. The creature is primarily quadrupedal but can rear onto its hind legs to reach terrifying heights.
Its skin is a dark grey, almost stone-like in appearance, covered in jagged plates that provide a natural armor. The Gravemaw Colossus's broad body is lined with spiny protrusions, like stalagmites and stalactites jutting out from its rocky hide, adding an extra layer of protection and making it blend perfectly with the subterranean surroundings.
The Gravemaw Colossus's head is dominated by a massive maw, hence its name. This terrifying orifice is filled with multiple rows of razor-sharp, stone-like teeth, each one as large as a full-grown dwarf. Its eyes are pitch black, except when it opens its maw, where a faint eerie glow emanates from its throat, reflecting off its eyes.
Its claws are massive, each one akin to a miner's pickaxe, able to tear through solid stone as if it were soft clay. These claws allow it to burrow through the earth with terrifying speed and to launch surprise attacks on unsuspecting victims.
When the Gravemaw Colossus moves, it does so with a thunderous rumble, causing the ground to quake beneath its enormous weight. The presence of this monstrosity is announced by tremors, collapsing tunnels, and the deafening roar it produces from its gaping maw.
Creature: The Luminant Leviathan
Size: Gargantuan
Type: Celestial (Fiend)
Alignment: Chaotic Evil
Armor Class: 18 (natural armor)
Hit Points: 300 (25d20+75)
Speed: 30 ft., fly 60 ft. (hover)
STR: 22 (+6)
DEX: 16 (+3)
CON: 17 (+3)
INT: 18 (+4)
WIS: 20 (+5)
CHA: 24 (+7)
Saving Throws: Dex +9, Int +10, Wis +11, Cha +13
Skills: Insight +11, Perception +11, Persuasion +13
Damage Resistances: bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities: charmed, frightened
Senses: truesight 120 ft., passive Perception 21
Languages: all, telepathy 120 ft.
Challenge: 15 (13,000 XP)
Abilities
Hover: The Luminant Leviathan can hover in place without needing to move.
Incorporeal Movement: The Luminant Leviathan can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Illumination: The Luminant Leviathan sheds bright light in a 30-foot radius and dim light for an additional 30 feet.
Actions
Multiattack: The Luminant Leviathan makes two Light Lash attacks.
Light Lash: Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) radiant damage.
Radiant Beam (Recharge 5-6): The Luminant Leviathan fires a beam of concentrated light in a line that is 60 feet long and 5 feet wide. Each creature in that line must make a DC 19 Dexterity saving throw, taking 45 (10d8) radiant damage on a failed save, or half as much damage on a successful one.
Legendary Actions
The Luminant Leviathan 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. The Luminant Leviathan regains spent legendary actions at the start of its turn.
Detect: The Leviathan makes a Wisdom (Perception) check.
Radiant Pulse (Costs 2 Actions): The Luminant Leviathan emits a burst of radiant energy. Each creature within 10 feet of it must succeed on a DC 19 Constitution saving throw or be blinded until the end of the creature's next turn.
Teleport (Costs 3 Actions): The Luminant Leviathan magically teleports, along with any equipment it is wearing or carrying, up to 60 feet to an unoccupied space it can see.
The Luminant Leviathan is a celestial fiend that illuminates the dark caverns of the Underdark. Unlike the Gravemaw Colossus, which relies on physical prowess and burrowing ability, the Luminant Leviathan uses radiant energy and its superior intellect. This beast thrives in the same environment but in a radically different way, representing the antithesis of the Gravemaw. As both creatures roam the same territory, their paths often cross, leading to cataclysmic encounters deep within the earth.
You know, I’m pretty sure you can use the tools to homebrew such a monster and either link to it or share it via Imgur or something. It would save a lot of space.