FLARD (GARGANTUAN CONSTRUCT CR 12)

  

gargantuan construct, lawful neutral

AC: 25 (natural armor), HP: 252 (12D20+120), Senses: truesight 120 ft., passive Perception 28, Speed: 0 ft.

STR: --, DEX: --, CON: 30, INT: 30, WIS: 30, CHA: 20

Skills: Insight +18, Knowledge skills (any) +18, Perception +18, Persuasion +9; Resistances: cold; Immunities: sleep and any mind-affecting spells; Languages: broadcast telepathy, all; CR: 12 (8,400 XP); PB: +4.

TRAITS
Legendary Resistance (3/day): If it fails a save, it can choose to expend one of its uses of this ability to succeed instead.
Internal Storage: It stores its treasure within itself. Any magic items it has stored within can be readily used. It can ignore all restrictions pertaining to the magic item in question.
Magic Resistance: It automatically has advantage on saves versus spells and spell-like effects.
Regeneration: It regenerates 10 HP at the start of its turn.

ACTIONS
Cone of Cold (at will): as per spell description.
Frightful Presence: Each creature of the Flard's choice that is within 120 ft. of it and aware of it must make a WIS Save DC22 or become frightened for 1 minute. The creature can repeat its save at the end of each of its turns, ending the effect on a success. If the creature's save is successful or the effect ends for it, the creature is immune to this effect for the next 24 hours.
Legend Lore: Cast any Divination spell.

LEGENDARY ACTIONS
Uses: 3. Immediately after another creature's turn, it can expend a use to use any of tits standard actions. It regains all expended uses at the start of each of its turns.

DESIGN NOTES / LORE
The Flard is one of the planar monsters detailed in the Dragon magazine #47. 

They appear as towering pillars of pure white marble with richly veined, pink streaks throughout. They have finite length and width, but infinite height. They are only ever encountered as individuals, and mostly on planes that are strongly lawfully-aligned. They were presumably created by a now-extinct race of humanoids for the sole purpose of answering impossible questions. They are extremely old and spend most of their time dormant, quietly gathering information. Each Flard has a specific name which can be used to trigger it awake when spoken.

Discovering a Flard name requires systematic, methodical research of the rarest and most ancient of texts. When the party speaks the Flard's name, it will awaken and will answer exactly one question with 100% accuracy. It will then sleep for another one thousand years. It cannot go back to sleep once they have been awakened unless they are first asked a question. When defeated, its treasure hoard can be accessed through a secret door found somewhere along its base.