Ancient Waffle

Legendary Resistance (5/Day). If the waffle fails a saving throw, it can choose to succeed instead. 

Magic Immunity. The waffle cannot be affected by spells (or their manifestations) of 6th level or lower.

Disturbing Revelations. The waffle cannot have its mind read or tampered with, by magical means or otherwise. A creature that attempts to do so must succeed on a DC 25 Intelligence saving throw or be forced to face profound multiversal truths and becomes petrified. This petrification cannot be undone by any means, even by use of a Wish spell. If another creature is able to learn the same truths as the affected creature, they also suffer the same form of petrification.

Insatiable Hunger. When a creature comes within a 1 mile radius of the waffle, the waffle is alerted to its presence and marks the creature as food. A creature marked as food cannot travel further than 1 mile away from the waffle until they die or the waffle is no longer conscious. A creature that attempts to leave the radius will be stopped, as if blocked by an invisible dome; teleportation from the radius, even by use of a Wish spell, is impossible. 

Passive Consumption. Every turn, a random creature that is marked as food must succeed on a DC 15 Constitution saving throw or suffer a level of exhaustion as their life force is devoured. This exhaustion takes one week to fade and otherwise cannot be removed, even by use of a Wish spell.

Siege Monster. The waffle deals double damage to objects and structures.

Multiattack. The waffle makes six attacks or instead makes three attacks and use its Eternal Death.

Tendril Swipe. Melee Weapon Attack: +19 to hit, reach 50 ft., one target. Hit: 45 (6d10 + 12) necrotic damage. 

Eternal Death. Melee Weapon Attack: +19 to hit, reach 300 ft., one target. Hit: 56 (8d10 + 12) necrotic damage. Additionally, the target is unavoidably sucked into the waffle's jaws and must succeed on a DC 20 Constitution saving throw or be killed and have its soul devoured. If a target succeeds, it falls 75 ft. and lands prone in front of the waffle.

Punish Dissent. The waffle makes an attack with one of its tendrils against a creature that targets it with a melee attack. The waffle makes this attack with disadvantage, but a successful hit is always critical. 

The waffle can take 5 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 waffle regains spent legendary actions at the start of its turn.

Tendril Swipe. The waffle uses Tendril Swipe.

Malevolent Sugar Rush (Costs 2 Actions). The waffle rolls a d10; on a 6 or higher the waffle restores a number of hit points equal to half the damage it has taken this round. On a 1, the waffle instead regurgitates a soul of a random creature it has consumed in the last week and takes 1d10 piercing damage. 

Baking of the Ancients (Costs 3 Actions). The waffle summons a dark, smokey aura that moves with it and extends in a radius of 50 ft. The ground in its area becomes difficult terrain, which the waffle ignores. Once on each of the waffle's turns, it can ignite every creature in its aura. Each ignited creature must make a DC 30 Dexterity saving throw, taking 15 (2d12) fire damage on a failed save, or half as much damage on a successful one. The aura lasts for 24 hours or until the waffle is no longer conscious.