Amethyst Nightmare Dimension (Deleted)

Regeneration. The amethyst nightmare dimension regains 10 hit points at the start of its turn. If the amethyst nightmare dimension takes silver and radiant damage, this trait doesn't function at the start of the amethyst nightmare dimension's next turn. The amethyst nightmare dimension dies only if it starts its turn with 0 hit points and doesn't regenerate.

Legendary Resistance (3/Day). If the amethyst nightmare dimension fails a saving throw, it can choose to succeed instead.

Limited Magic Immunity. The amethyst nightmare dimension can't be affected or detected by spells of 6th level or lower unless it wishes to be. It has advantage on saving throws against all other spells and magical effects.

Magic Negation (Melee Spell Attack). The amethyst nightmare dimension can unravel magic with a touch, nullifying spells with a swipe of its hands or claws. On a hit, the amethyst nightmare dimension dispels one spell affecting the target. The spell must be of 6th level or lower. For 7th level or higher spells, the target must succeed on a DC 17 Intelligence saving throw, or the spell is dispelled.

Magic Weapons. The amethyst nightmare dimension's weapon attacks are magical.

Spellcasting. The amethyst nightmare dimension is a 19-level spellcaster, it casts one of the following spells, using Wisdom as the spellcasting ability (spell save DC 17, +9 to hit with spell attacks):

Cantrips (at will): acid splash, chill touch, detect evil and good, detect magic, dimension door, fire bolt, gust, identify, mage hand, prestidigitation, ray of frost, scrying, shocking grasp, soul cage

1st level (4 slots): color spray, comprehend languages, feather fall, magic missile

2nd level (3 slots): invisibility (self only), levitate, mirror image

3rd level (3 slots): fly, haste, slow

4th level (3 slots): banishment, black tentacles, ice storm

5th level (3 slots): creation, conjure elemental (amethyst gargoyle only)*, telekinesis

6th level (2 slots): disintegrate, globe of invulnerability

7th level (1 slot): mirage arcane

8th level (1 slot): demiplane

9th level (1 slot): foresight (self only)*

Multiattack. The amethyst nightmare dimension makes three attacks: two with its claws, and one with either its bite or its tail.

Claws. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 13 (2d6 + 6) slashing damage that magic negation.

Bite. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) piercing damage.

Curse of Crystal Petrified Tail. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 10 (2d6 + 3) piercing damage. The amethyst nightmare dimension's tail stabs curse, A creature restrained by this spell must make a DC 17 Constitution saving throw at the end of each of its turns. If it successfully saves against this spell three times, the spell ends. If it fails it is saved three times, it is turned to crystallized petrified wood and subjected to the petrified condition for the duration. The successes and failures don't need to be consecutive; keep track of both until the target collects three of a kind.

Portal. The amethyst nightmare dimension magically dimension door, along with any equipment it is wearing or carrying, up to 500 feet to an unoccupied space it can see.