September 17, 2018


Comments from the Finger: I wrote this silly monster as a mash up of the tarrasque and the flumph for a stream of The RPG Lab. It was a total blast and we wrote most of another flumph-themed creature in the stream; you should totally check it out! Art by the extremely talented Lucas Ferreira CM

Gargantuan aberration, chaotic neutral

Armor Class 18 (natural armor)
Hit Points 296 (16d20 + 128)
Speed 10 ft., fly 40 ft. (hover)

STR 26 (+8) DEX 22 (+6) CON 26 (+8)
INT 15 (+2) WIS 12 (+1) CHA 12 (+1)

Saving Throws Int +7, Wis +6, Cha +6
Damage Vulnerabilities psychic
Damage Immunities bludgeoning, piercing, and slashing from nonmagical weapons
Condition Immunities charmed, frightened, paralyzed, poisoned
Senses blindsight 120 ft.
Languages understands Undercommon but can't speak
Challenge 18 (20,000 XP)

Legendary Resistance (3/Day). If the giga-flumph fails a saving throw, it can choose to succeed instead.

Magic Resistance. The giga-flumph has advantage on saving throws against spells and other magical effects.

Prone Deficiency. If the giga-flumph is knocked prone, roll a die. On an odd result, the giga-flumph lands upside-down. While upside down, the giga-flumph can't move, is incapacitated, and does not benefit from its Reflective Cap trait or its damage immunities. At the end of each of its turns, the giga-flumph can make a DC 10 Dexterity saving throw, righting itself if it succeeds.

Reflective Cap. Any time the giga-flumph is targeted by a magic missile spell, a line spell, or a spell that requires a ranged attack roll, roll any die. On an even result, the giga-flumph is unaffected. On an odd result, the giga-flumph is unaffected, and the effect is reflected back at the caster as though it originated from the giga-flumph, turning the caster into the target.

Multiattack. The giga-flumph can use its frightful presence or its toxic cloud and then make four tendril attacks.

Tendrils. Melee Weapon Attack: +14 to hit, reach 15 ft., one creature. Hit: 12 (1d12 + 6), piercing damage plus 18 (4d8) acid damage.

Foul Cloud (Recharge 5-6). Each creature within a 50-foot radius sphere centered on the giga-flumph must make a DC 18 Constitution saving throw or be coated in a foul-smelling mucus for 1d4 hours. While coated, the creature is poisoned and exude a stench so horrible that other creatures within 5 feet of it are poisoned while they remain in that area. An affected creature can use its action to attempt to remove the foul-smelling mucus, ending the poisoned condition and removing the stench on a success. A creature automatically succeeds on this saving throw if he has a bath with soap.

Frightful Presence. Each creature of the giga-flumph’s choice within 120 feet of it and aware of it must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the giga-flumph is within line of sight, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it, the creature is immune to the giga-flumph’s Frightful Presence for the next 24 hours.

The giga-flumph 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 giga-flumph regains spent legendary actions at the start of its turn.

Attack. The giga-flumph makes one attack with its tendrils.

Move. The giga-flumph moves up to half its speed

Paralyze (Costs 2 Actions). The giga-flumph makes a tendril attack against a creature, which must make a DC 18 Constitution saving throw or be paralyzed for 1 minute.


  1. Ok, this is SUPER AWESOME.

    With a few reservations, of course:
    I think it should immune to poison, or at least immune to poison from it's own cloud (as-is, it's worth it for someone to take the cloud and move next to the flumph).

    I get that you took the alignment from the tarrasque, but this guy has 15 int, so it can't logically be unaligned.

    The fact that it's CR 18 is a problem, because that's too hard for most groups, and I won't be able to use any other monster forever now that I've seen it. I guess TPK is coming.

    1. I agree, with 15 Int it definitely knows right from wrong. I'd have copied the flumph's alignment.

    2. Yup, it needs poisoned immunity. I'm going with chaotic neutral so that the door is open for it to be used as an ally or an antagonist.

  2. This is truly magnificent. A marvel among monsters to shake the foundations of the earth. I feel compelled to craft a campaign in which this fights the Tarrasque alongside the party at its climax, released from its containment for the task or spawned as the result of some mad wizard tampering with the foundations of life again.
    (As a side note, there appears to be a typo with the legendary attack action referring to a claw or tail attack when the Giga-Flumph only possesses tendrils.)