Chaos Elemental

Chaotic Form. The chaos elemental's form is chaotic and ever-changing. Each of its various forms grant it different abilities. At the beginning of the elemental's turn, roll a d8. It gains the following form and abilities.

1 - Fire. The elemental gains immunity to fire damage, and its slam attack deals fire damage. It can also fit through a space as small as one inch, and when it passes through a creature's space the creature takes 5 (1d10) fire damage and catches on fire, taking the same damage at the beginning of their turns. The creature can take an action to douse the flames.
2 - Water. The elemental gains immunity to cold damage, and its slam attack deals cold damage. It can also fit through a space as small as one inch. When in this form and the elemental deals cold damage to a creature, that creature's movement speed is reduced by 10 ft. until the end of the elemental's next turn.
3 - Earth. The elemental gains immunity to bludgeoning, slashing, and piercing damage from nonmagical attacks. Its slam attack deals bludgeoning damage, and it gains a burrowing speed of 60 ft. if it is moving through unworked stone. If it ends its turn inside of stone and its form shifts to another type of elemental, it takes 11 (2d10) force damage and is shunted to the nearest possible space.
4 - Air. The elemental gains immunity to bludgeoning, slashing, and piercing damage from nonmagical attacks and a flying speed of 60 ft.. Its slam attack deals lightning damage and moves a creature up to 10 ft. in any direction.
5 - Acid. The elemental gains immunity to acid damage, can pass through a space as small as one inch, deals acid damage with its slam attack, and when it deals damage to a creature, one piece of armor it is wearing's armor class bonus is reduced by 1. If the armor's armor class bonus is reduced to 10, it is destroyed.
6 - Psychadelic. The elemental gains immunity to psychic damage, deals psychic damage with its slam attack, and when it deals damage to a creature, the creature must make a DC 14 Wisdom saving throw or become frightened of the elemental until the end of the elemental's next turn.
7 - Light. The elemental gains immunity to radiant damage, deals radiant damage with its slam attack, and when a creature that can see the elemental starts its turn within 30 ft. of the elemental must make a DC 14 Constitution saving throw or become blinded until the end of the elemental's next turn.
8 - Death. The elemental gains immunity to necrotic damage, deals necrotic damage with its slam attack, and if the elemental reduces a creature to 0 hit points with this form, the creature is killed and rises as a zombie at the beginning of its next turn under the elemental's control, per the animate dead spell.

Immutable Form. The elemental's form cannot be changed or altered by any means.

Multiattack. The elemental makes three slam attacks.

Slam. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 19 (3d8 + 5) of the associated damage type with the elemental's current form.

Energy Flood (Recharge 6). The chaos elemental shifts its form into a maelstrom of the type of energy associated with its current form. Each creature within 30 ft. of the elemental must make a DC 14 Constitution saving throw, taking 45 (10d8) of the associated damage type on a failed save or half on a success.

Tides of Chaos. When a creature that the elemental can see makes a roll within 30 ft. of the elemental, it can force that creature to roll with advantage or disadvantage (the elemental's choice).

The Chaos Elemental can take 3 Legendary Actions, choosing from the options below. Only one legendary action can be used at a time, and only at the end of another creature's turn. Spent legendary actions are regained at the start of each turn.

Shifting Form (Costs 1 Action). The Chaos Elemental rolls on the Chaotic Form table and shifts its form accordingly.