Blurhog

Chaos Ascension. If the Blurhog comes into contact with a powerful magical artifact, it is enveloped in a radiant aura. It gains immunity to all damage types except for Fire and Piercing damage, Adds 5 points to each ability score, and has a Flying speed of 65 ft.

Wild Magic. The [monster name] is a #-level spellcaster. Its spellcasting ability is [ability score] (spell save DC 8, +5 to hit with spell attacks). The [monster name] has following [class name] spells prepared:
Cantrips (at will): Viscous Mockery, Animal Friendship.
1st level (8 slots): Longstrider, Silvery Barbs

Homing Dash. Melee Weapon Attack: The Blurhog barrels towards 1 target in sight at breakneck speed. +8 to hit, 1 target. Hit: 10 (2d6 + 8) Force damage.

Supersonic Mania. Ranged Weapon Attack: +5 to hit, range 25 ft., 6 targets. Hit: 8 (3d6 + 8) thunder damage.

Curl-Up. The Blurhog curls up into a prickly ball. As long as it chooses to stay in this form, Any creature or tearable material that touches it takes 2d6 Piercing damage. While in a ball, it is functionally under the Paralyzed condition, but can return to normal at any time.

If the Blurhog takes the Curl-Up action while running or while midair, it bowls itself into the target at great speed. If the target fails a DC25 Dex Save, it takes both 2d6 Piercing damage, and an equal amount in Force damage.

Reaction Name. Enter the description for your action.

The Blurhog may use its legendary actions only after the Chaos Ascension trait is triggered.

Wild Chronomancy (Costs 2 Actions). The creature may effectively cast the spell Time Stop.

Wild Retry (Costs 3 Actions). 3 times per encounter, the creature can change the events of the battle to succeed after failing a saving throw.

Wild Transfer (Costs X Actions). The Blurhog may imbue its allies with wild magic to grant them the effects of the Chaos Ascension trait. It costs 2 actions per ally ascended.